CA2274202A1 - Diaza-spiro[3,5]nonane derivatives - Google Patents

Abstract

The invention relates to compounds of the general formula (see formula I) wherein R1 is C6-12-cycloalkyl, optionally substituted by lower alkyl or C(O)O lower alkyl, indan-1-yl or indan-2-yl, optionally substituted by lower alkyl;
acenaphthen-1-yl; bicyclo[3.3.1]non-9-yl, octahydro-inden-2-yl;
2,3-dihydro-1H-phenalen-1-yl; 2,3,3a,4,5,6-hexahydro-1H-phenalen-1-yl, decahydro-azulen-2-yl; bicyclo[6.2.0]dec-9-yl; decahydro-naphthalen-1-yl, decahydro-naphthalen-2-yl; tetrahydro-naphthalen-1-yl, tetrahydro-naphthalen-2-yl or 2-oxo-1,2-diphenyl-ethyl;
R2 is =O or hydrogen, R3 is hydrogen, isoindolyl-1,3-dione, lower alkoxy, lower alkyl, amino, benzyloxy, -CH2OR5 or -CH2N(R5)2;
R4 is hydrogen or -CH2OR5;
R5 is hydrogen or lower alkyl;
A is cyclohexyl or phenyl, optionally substituted by lower alkyl, halogen or alkoxy;
to racemic mixtures and their corresponding enantiomers and or pharmaceutically acceptable acid addition salts thereof.
The compounds of the present invention are agonists and/or antagonists of the orphamin FQ(OFQ) receptor and therefore useful in the treatment of diseases, related to this receptor.

Description

Ref. 20114 The present invention relates to compounds of the general formula Ra R4 Rz N
RIiN A
wherein Rl is Cs-12-cycloalkyl, optionally substituted by lower alkyl or C(O)O lower alkyl, indan-1-yl or indan-2-yl, optionally substituted by lower alkyl;
acenaphthen-1-yl; bicyclo[3.3.1]non-9-yl, octahydro-inden-2-yl; 2,3-dihydro-1H-phenalen-1-yl; 2,3,3a,4,5,6-hexahydro-1H-phenalen-1-yl, decahydro-azulen-2-yl; bicyclo[6.2.0]dec-9-yl; decahydro-naphthalen-1-yl, decahydro-naphthalen-2-yl; tetrahydro-naphthalen-1-yl, tetrahydro-1o naphthalen-2-yl or 2-oxo-1,2-diphenyl-ethyl;
RZ is =O or hydrogen, R3 is hydrogen, isoindolyl-1,3-dione, lower alkoxy, lower alkyl, amino, benzyloxy, -CHaOR5 or -CH2N(R5)2;
R4 is hydrogen or -CHzOR5;
R~ is hydrogen or lower alkyl;
A
is cyclohexyl or phenyl, optionally substituted by lower alkyl, halogen or alkoxy, and to pharmaceutically acceptable acid addition salts thereof.
The compounds of formula I and their salts are characterized by valuable 2o therapeutic properties. It has surprisingly been found that the compounds of Pop/So/ 11.02.1999 the present invention are agonists and/or antagonists of the orphanin F(a (OFQ) receptor. Consequently they are useful in the treatment of psychiatric, neurological and physiological disorders, especially, but not limited to, amelioration of symptoms of anxiety and stress disorders, depression, trauma, memory loss due to Alzheimer's disease or other dementias, epilepsy and convulsions, acute and/or chronic pain conditions, symptoms of addictive drug withdrawal, control of water balance, Na+ excretion, arterial blood pressure disorders and metabolic disorders such as obesity.
In the following references these indications have been described:
to - Nociceptin/orphanin F(1 and the opioid receptor-like ORL1 receptor, Eur. J. Pharmacol.. 340: 1-15~ 1997;
- The orphan opioid receptor and its endofenous ligand ociceptin/orphanin FQ, Trends Pharmacol. Sci., 18:293-300, 1997;
- Orphanin FQ is a functional anti-opioid peptide, Neuroscience. 75:333-337. 1996:
- Orphanin FQ/nociceptin-lack of antinociceptive, hyperalgesic or allodynic effects in acute thermal or mechanical tests, following intracerebroventricular or intrathecal administration to mice or rats, Eur. J.
pain. 2: 267-280, 1998;
- Orphanin FQ acts as an anxiolytic to attenuate behavioral responses to stress, Proc. Natl. Acad. Sci.. USA, 94: 14854-14858, 1997;
- Orphanin FCa, an agonist of orphan opioid receptor ORL1, stimulates feeding in rats, Neuroreport~ 8: 369-371, 1996;
- Facilitation of long-term potentiation and memory in mice lacking nociceptin receptors, Nature. 394: 577-581, 1998;
- Distribution of nociceptin/orphanin FQ receptor transcript in human central nervous system and immune cells, J. Neuroimmuno. 81: 184-192. 1998;
- Orphamin FCa plays a role in sepsis, Prog. Clin. Biol. Res. ( 1998) 397, 315-325.

OFQ, a heptadeca-peptide, has been isolated from rat brain and is a natural ligand to a G-protein coupled receptor (OFQ-R), found at high levels in brain tissue. OFQ exhibits agonistic activity at the OFQ-R both in vitro and in vivo.
Julius (Nature 377,476, [1995]) discusses the discovery of OFQ noting that this peptide shares greatest sequence homology with dynorphin A, an established endogenous ligand for opioid receptors. OFQ inhibits adenylate cyclase in CHO(LC 132+) cells in culture and induces hyperalgesia when administered intra-cerebroventricularly to mice. The pattern of results i0 indicate that this heptadecapeptide is an endogenous agonist of the LC 132 receptor and it appears to have pro-nociceptive properties. It has been described that when injected intra-cerebroventricularly in mice, OFQ slowes down locomotive activity and induces hyperalgesia and it has been concluded that OFQ may act as a brain neurotransmitter to modulate nociceptive and locomotive behavior.
Objects of the present invention are the compounds of formula I and pharmaceutically acceptable addition salts thereof, racemic mixtures and their corresponding enantiomers, the preparation of the above-mentioned compounds, medicaments containing them and their manufacture as well as 2o the use of the above-mentioned compounds in the control or prevention of illnesses, especially of illnesses and disorders of the kind referred above, or in the manufacture of corresponding medicaments.
The following definitions of the general terms used in the present description apply irrespective of whether the terms in question appear alone or in combination, such as lower alkyl and lower alkoxy.
As used herein, the term "lower alkyl" denotes a straight- or branched-chain alkyl group containing from 1 to 6 carbon atoms, for example, methyl, ethyl, propyl, isopropyl, n-butyl, i-butyl, 2-butyl, t-butyl and the like.
Preferred lower alkyl groups are groups with 1 - 4 carbon atoms.
The term "cycloalkyl" denotes a saturated carbocyclic group containing from 6 - 12 carbon atoms, preferred are cyclohexyl, cyclooctyl, cyclononyl and cyclodecyl.
The term "halogen" denotes chlorine, iodine, fluorine and bromine.

The term "pharmaceutically acceptable acid addition salts" embraces salts with inorganic and organic acids well-known in the art for pharmaceutic purposes, such as hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, citric acid, formic acid, fumaric acid, malefic acid, acetic acid, succinic acid, tartaric acid, methane-sulfonic acid, p-toluenesulfonic acid and the like.
Preferred compounds of the present invention are those of formula I, in which Rl is (Cs-s)-cycloalkyl or decahydro-naphthalen-2-yl, for example the following compounds:
3,3-bis-hydroxymethyl-7-(cis-4-isopropyl-cyclohexyl)-1-phenyl-1,7-diaza-to spiro[3.5]nonan-2-one;
7-(cis-4-isopropyl-cyclohexyl)-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one;
7-(cis-4-isopropyl-cyclohexyl)-1-phenyl-1,7-diaza-spiro [3.5]nonane;
7-cyclononyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one;
7-cyclononyl-1-phenyl-1,7-diaza-spiro[3.5]nonane;
7-cyclooctyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one;
7- cycloheptyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one and (2RS,4aSR,8aRS)-7-(decahydro-naphthalen-2-yl)-1-phenyl-1,7-diaza-spiro [3. 5] nonan-2-one 2o The present compounds of formula I and their pharmaceutically acceptable salts can be prepared by methods known in the art, for example by processes described below, which comprise a) reductively aminating a compound of formula R
I I
with a compound of formula Ra R Rz N
HN~ A III
A
wherein Rl, R2, R3, R4 and ~ have the significances given above, or b) condensing an imine of formula N
i A
~~N~
R IV
with a carboxylic acid derivative of formula R
to a compound of formula N
R~iN~ A

A
wherein Rl, R3, R4 and ~ have the significances given above, and X is halogen, to or c) condensing a 4-phenylamino-4-piperidinocarbonitrile or a 4-cyclohexyl-amino-4-piperidinocarbonitrile of formula H
N\ ~
~A
R~iN
with methylbromoacetate in the presence of a metal to a compound of formula N
R~iN~ A
~ I-2 A
wherein Rl and ~ are have the significances given above, or d) reducing a compound of formula N
R~iN~ A

to an azetidine of formula N
R'~N~ ~ I-3 A
wherein Rl, R3, R4 and ~ have the significances given above, or A
e) hydrogenating a compound of formula I, wherein ~ is phenyl, to a A
compound of formula I, wherein ~ is cyclohexyl, and, if desired, converting a racemic mixture into its enantiomeric components thus obtaining l0 optically pure compounds, and/or converting the compounds obtained into pharmaceutically acceptable acid addition salts.
In accordance with process variant a) the reductive amination of a keto compound of formula II with an amine of formula III is carried out by stirring with a dehydrating agent in the presence of molecular sieves (4~1), in an inert solvent, such as toluene or tetrahydrofuran (THF), at reflux temperature. An alternative method is the dehydration in the presence of an acidic catalyst with removal of water, e.g. with azeotropic removal of water, or with tetraisopropyl-orthotitanate in THF.
2o The resulting intermediate enamine or imine is then reduced with a reducing agent, such as metal hydrides or hydrogen in the presence of a hydrogenating catalyst, preferably with sodium cyanoborohydride in a protic solvent, for example in a mixture of THF and ethanol at acidic pH.
Examples of corresponding keto compounds of formula II are the following:

2-indanone, 1,3-dihydro-4-methyl-2H-inden-2-one, 4-(1-methylethyl)-cyclohexanone, cis-octahydro-inden-2-one, cyclopctanone, cyclodecanone, decahydro-azulen-2-one, cyclononanone, cycloundecanone, cycloheptanone, cyclododecanone, bicyclo[6.2.0]dec-9-one or 1,3-dihydro-2H-inden-2-one.
The condensation of an imine of formula IV with a ketene of formula V in accordance with variant b) is carried out in the presence of a base, such as triethylamine. The reaction is carried out at 0°C and then stirred at room temperature for about 24 h.
In accordance with process variant c) a 4-phenyl- or 4-cyclohexyl-4-to piperidinocarbonitrile of formula VI is condensed with methylbromoacetate in the presence of a metal, such as zinc. The reaction is carried out in an inert solvent, for example THF. The mixture is heated for about 1 1/2 h, the phases are separated and isolated to yield a compound of formula I-2.
The reduction of a compound of formula I-1 to an azetidine of formula I-3 in accordance with process variant d) is carried out with a reducing agent, preferably with a metal hydride, such as lithium aluminiumhydride by methods, known in the art. A mixture of aluminium trichloride and the metal hydride is treated with a compound of formula I-1 in THF to yield a compound of formula I-3.
Process variant e) relates to the hydrogenation of a compound of formula I, wherein ~ is phenyl. The desired cyclohexyl ring is yielded in a protic solvent, such as methanol and in the presence of a hydrogenating catalyst, for example in the presence of platinum oxide. The reaction is carried out under hydrogen pressure between 1 and 50 bar.
Racemic mixtures can be converted into their enantiomeric components in conventional manner, for example by preparative HPLC.
The salt formation is effected at room temperature in accordance with methods which are known per se and which are familiar to any person skilled in the art. Not only salts with inorganic acids, but also salts with organic acids come into consideration. Hydrochlorides, hydrobromides, sulphates, nitrates, citrates, acetates, maleates, succinates, methanesulphonates, p-toluene sulfonates and the like are examples of such salts.

_8-The compounds of formulae II, III, IV, V and VI which are used as starting materials are known compounds or can be prepared by methods known per se.
The following scheme 1 describes the cyclization (condensation) of compounds of formulae IV and V or II and III-1 to a compound of formula I-1.
In scheme 2 is shown the cyclization (condensation) of compounds of formula VI with methylbromoacetate to compounds of formula I-2.
Scheme 1 i Rs R~~N~ ~X
IV R° V
R3 R4 ~
I
N
N
R,i ~ A I-1 ~O N
( R + HNJ

wherein Rl, R3, R4 and ~ have the significances given above, and X is to halogen.

Scheme 2 O
Br~O/ ~
N +
iiN~ ~ ~iN~. A
R VI R

As mentioned earlier, the compounds of formula I and their pharma-ceutically usuable addition salts possess valuable pharmacodynamic properties. It has been found that the compounds of the present invention are agonists and/or antagonists of the OFQ receptor and have effects in animal models of psychiatric, neurological and physiological disorders, such as anxiety, stress disorders, depression, trauma, memory loss due to Alzheimer's disease or other demential, epilepsy and convulsions, acute and/or chronic pain conditions, symptoms of addictive drug withdrawal, control of water 1o balance, Na+ excretion, arterial blood pressure disorders and metabolic disorders such as obesity.
The compounds were tested for pharmacologic activity in accordance with the methods given hereinafter:
Methods of OFQ-R Binding Assay Cell Culture HEK-293 cells adapted to suspension growth (293s) were cultured in HL
medium plus 2% FBS. The cells were transfected with the rat OFQ receptor cDNA (LC132), FEBS Lett. 347, 284-288, 1994, cloned in the expression vector pCEP4 (Invitrogen, SanDiego, CA, USA) using lipofectin (Life Technologies, 2o Bethesda, MD, USA). Transfected cells were selected in the presence of hygromycin (1000 U/ml) (Calbiochem, SanDiego, CA, USA). A pool of resistant cells was tested for OFQ-R expression by binding of [3H]-OFQ (Amersham PLC, Buckinghamshire, England). These cells (293s-OFQ-R) were expanded for large scale culture and membrane preparation.
Membrane preparation 293s-OFQ-R cells were harvested by centrifugation, washed 3 times with phosphate buffered saline (PBS) before resuspension in buffer A (50 mM
Tris-HCl, pH 7.8, 5 mM MgCl2, 1 mM EGTA) and disruption with a tissue homogenizer (30 seconds, setting 4, Pt 20, Kinematica, Kriens-Lucern, 3o Switzerland). A total membrane fraction was obtained by centrifugation at 49,000 x g at 4°C. This procedure was repeated twice and the pellet was resuspended in buffer A. Aliquots were stored at -70°C and protein concentrations were determined using the BCATM Protein Assay Reagent (Pierce, Rockford, IL) following the manufacturer's recommendations.
Binding Assays [3H]-OFQ competition studies were carried out with 77 ~zg membrane protein in a final assay volume of 0.5 ml buffer A plus 0.1% BSA and 0.01%
bacitracin (Boehringer-Mannheim, Mannheim, Germany) for one hour at room temperature. 50 nM unlabeled OFIa was used to define the non-specific to binding. The assays were terminated by filtration through Whatman GF/C
filters (Unifilter-96, Canberra Packard S.A., Zurich, Switzerland) pretreated with 0.3% polyethylenimine (Sigma, St. Louis, MO, USA) and 0.1% BSA
(Sigma) for 1 hour. The filters were washed 6 times with 1 ml of ice bold 50 mM Tris-HCl pH 7.5. The retained radioactivity was counted on a Packard Top-Count microplate scintillation counter after addition of 40 pl of Microscint 40 (Canberra Packard). The effects of compounds were determined using at least 6 concentrations in triplicate, and determined twice. ICSO values were determined by curve fitting and these calues were converted to Ki values by the method of Cheng and Prusoff, Biochem. Pharmacol., 22, 3099, 1973.
2o The affinity to the OFQ-receptor, given as pKi, is in the range of 6,5 to 9,3.
The preparation of the following compounds is described in Examples 1-54:
Rs R4 R2 N
R, iN A
Rl R2 R3 R4 A Example No.
O H H phenyl 1 O H H phenyl 2 i O H H phenyl 3 Ha H H phenyl 4 i H2 H H phenyl 5 H2 H H phenyl 6 O H H phenyl 7 O H H phenyl 8 t l~
H2 H H phenyl 9 s O H H phenyl 10 Hz H H phenyl 11 O H H phenyl 12 H
" Hz H H phenyl 13 H
O H H phenyl 14 Hz H H phenyl 15 O H H phenyl 16 \ /-O H H phenyl 17 O H H phenyl 18 H
..~~ O H H phenyl 19 H
O H H phenyl 20 O H H phenyl 21 H2 H H phenyl 22 Ha H H phenyl 23 Hz H H phenyl 24 O H H phenyl 25 H2 H H phenyl 26 H H2 H H phenyl 27 (1RS, 3aSR) " H2 H H phenyl 28 I~
(1RS, 3aRS) O H H phenyl 29 Hz H H phenyl 30 O H H phenyl 31 O H H ~ ~ c" 32 I
Ha H H phenyl 33 " O H H phenyl 34 li " a~ O H H phenyl 35 hi " ~ H2 H H phenyl 36 H
O ~ ~ H phenyl 37 N
O -OCHs H phenyl 38 O _o / \ H phenyl 39 ' O -CHzOH -CHZOH phenyl 40 i ' O -CHzOH -CHaOH phenyl 41 O H H phenyl 42 H
H2 H H phenyl 43 H
' H2 -CH20H -CH20H phenyl 44 O -CH20H -CHaOH phenyl 45 O H H phenyl 46 o ~' ;~--~--~ Hz -CHzOH -CHzOH phenyl 47 ' H2 -CH20H -CH20H phenyl 48 i ' O H -CH20H phenyl 49 i O H -CHaOH phenyl 50 t phenyl O H H 4-Cl- 52 phenyl O H H 3-Cl- 53 i phenyl t phenyl The compounds of formula I as well as their pharmaceutically usable acid addition salts can be used as medicaments, e.g. in the form of pharmaceutical preparations. The pharmaceutical preparations can be administered orally, e.g. in the form of tablets, coated tablets, dragees, hard and soft gelatine capsules, solutions, emulsions or suspensions. The administration can, however, also be effected rectally, e.g. in the form of suppositories, or parenterally, e.g. in the form of injection solutions.
The compounds of formula I and their pharmaceutically usable acid to addition salts can be processed with pharmaceutically inert, inorganic or organic excipients for the production of tablets, coated tablets, dragees and hard gelatine capsules. Lactose, corn starch or derivatives thereof, talc, stearic acid or its salts etc can be used as such excipients e.g. for tablets, dragees and hard gelatine capsules.
i5 Suitable excipients for soft gelatine capsules are e.g. vegetable oils, waxes, fats, semi-solid and liquid polyols etc.
Suitable excipients for the manufacture of solutions and syrups are e.g.
water, polyols, saccharose, invert sugar, glucose etc.
Suitable excipients for injection solutions are e.g. water, alcohols, polyols, 2o glycerol, vegetable oils etc. Suitable excipients for suppositories are e.g.
natural or hardened oils, waxes, fats, semi-liquid or liquid polyols etc.
Moreover, the pharmaceutical preparations can contain preservatives, solubilizers, stabilizers, wetting agents, emulsifiers, sweeteners, colorants, flavorants, salts for varying the osmotic pressure, buffers, masking agents or antioxidants. They can also contain still other therapeutically valuable substances.
The dosage can vary within wide limits and will, of course, be fitted to the individual requirements in each particular case. In general, the effective dosage for oral or parenteral administration is 0,01-20 mg/kg/day, preferred as a dosage of 0,1-10 mg/kg/day for all described indications. The daily dosage for an adult of 70 kg weight is therefore between 0,7-1400 mg/day, preferred is 7-700 mg/day, although the above upper limit can also be exceeded when necessary.
io The following Examples illustrate the present invention without limiting it. All temperatures are given in degrees Celsius.
Example 1 7-Indan-2-Yl-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) i5 2-Indanone (2.3 mmol) was dissolved in toluene, 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one (2.3 mmol) and molecular sieves (4~, 2.5 g) were added.
The mixture was refluxed with stirring for 16 h, filtered and the filtrate was evaporated. The residue was dissolved in THF/ethanol (25 ml, 9:1), sodium cyanoborohydride (2.3 mmol) was added and the pH was adjusted to 4. The 2o mixture was stirred for 3 h at room temperature. Ice-water (30 ml) and potassium carbonate solution (50%, 30 ml) were added. The mixture was extracted twice with methylene chloride, organic phases were pooled, dried with MgS04 and concentrated. Chromatography on silica gel (ethyl acetate/n-hexane, 1:1) yielded the desired product which was crystallized as its HCl-salt 25 from ethanol/ethyl acetate. 0.47 g (55%) 7-indan-2-yl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one hydrochloride (1:1) as a colorless solid , m.p.
>250°C and MS: m/e = 332.5 (M+).
Example 2 (RS)-7-(4-Methyl-indan-2-vl)-1-phenyl-1, 7-diaza-spiro f 3.51 nonan-2-one 3o hydrochloride (1:1) The title compound, m.p. >250°C and MS: m/e = 347.4 (M+H+) was prepared in accordance with the general method of example 1 from 1,3-dihydro-4-methyl-2H-inden-2-one and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.

Example 3 cis-7-(4-Isoprop,~yclohexvl)-1-phenyl-1 7-diaza-spiro f 3.51nonan-2-one hydrochloride (1:1) The title compound, m.p. >250°C and MS: m/e = 341.3 (M+H+) was prepared in accordance with the general method of example 1 from 4-( 1-methylethyl)-cyclohexanone and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 4 (RS)-7-(4-Methyl-indan-2-yl)-1 phenyl-1,7-diaza-spirof3.51nonane hydrochloride (1:1) to A mixture of aluminiumtrichloride (3 mmol) and lithium aluminiumhydride (3 mmol) in diethylether (5 ml) was heated for 1 h. The solution was then added to a mixture of (RS)-7-(4-methyl-indan-2-yl)-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one(1 mmol) in THF (20 ml). Heating commenced for 4 h.
Water (50 ml) and methylenchloride (100 ml) were added, the phases were separated and the organic phase was dried with Na2S04 and concentrated to yield the desired product which was crystallized as its HCl-salt from ethanol/ethyl acetate. 80 mg (20%) (RS)-7-(4-methyl-indan-2-yl)-1-phenyl-1,7-diaza-spiro[3.5]nonane hydrochloride (1:1) as a colorless solid , >219°C dec.
and MS: m/e = 333.3 (M+H+).
2o Example 5 cis-7-(4-Isopropyl-cyclohexvl)-1-phenyl-1 L7-diaza-spiro f 3.51 nonane h~~drochloride (1:1) The title compound, m.p. 207°C and MS: m/e = 327.4 (M+H+) was prepared in accordance with the general method of example 4 from cis-7-(4-isopropyl-cyclohexyl)-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 6 traps-7-(4-Isopropyl-c~clohexvl)-1-phenyl-1 7-diaza-spiro f 3.51nonane hydrochloride (1:1) The title compound, m.p. 229°C and MS: m/e = 327.4 (M+H+) was prepared in 3o accordance with the general method of example 4 from traps-7-(4-isopropyl-cyclohexyl)-1-phenyl-1, 7-diaza-spiro [3. 5] nonan-2-one.

Example 7 trans-7-(4-Isopropyl-cyclohexyl)-1-phenyl-1, 7-diaza-spiro f 3.51nonan-2-one hydrochloride (1:1) The title compound, m.p. >250°C and MS: m/e = 341.3 (M+H+) was prepared in accordance with the general method of example 1 from 4-(1-methylethyl)-cyclohexanone and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 8 (RS)-7-Acenaphthen-1~1-1-phenyl-1.7-diaza-spiro f 3.51 nonan-2-one hdrochloride (1:1) to The title compound, white solid, m.p. 245°C (dec.) and MS: m/e =
369.3 (M+H+) was prepared in accordance with the general method of example as from (RS)-4-phenylamino-1-(acenaphthen-1-yl)-piperidine-4-carbonitrile.
Example 9 (RS)-7-Acenaphthen-1-yl-1-phenyl-1.7-diaza-spirof3.51nonane hydrochloride 1:1 The title compound, white solid, m.p. 184°C (dec.) and MS: m/e = 355.3 (M+H+) was prepared in accordance with the general method of example 4 from (RS)-7-acenaphthen-1-yl-1-phenyl-1,7-diaza-spiro [3.5]nonan-2-one.
Ezample 10 7-Bicyclof3.3.llnon-9-yl-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) The title compound, white solid, m.p. 292°C and MS: m/e = 339.3 (M+H+) was prepared in accordance with the general method of example as from 1-bicyclo [3.3.1] non-9-yl-4-phenylamino-piperidine-4-carbonitrile.

Example 11 7-Bicvclof3.3.llnon-9-vl-1-phenyl-1.7-diaza-snirof3.51nonane hydrochloride 1:1 The title compound, white solid, m.p. 178°C and MS: m/e = 325.4 (M+H+) was prepared in accordance with the general method of example 4 from 7-bicyclo [3.3.1] non-9-yl-1-phenyl-1,7-diaza-spiro [3.5]nonan-2-one.
Example 12 (RS)-7-(Octahydro-inden-2-vl)-1-phenyl-1.7-diaza-spiro f 3.51nonan-2-one hydrochloride (1:1) to The title compound, m.p. 312°C (dec.) and MS: m/e = 339.3 (M+H+) was prepared in accordance with the general method of example 1 from cis-octahydro-inden-2-one and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 13 (RS)-7-(Octahvdro-inden-2-vl)-1-phenyl-1.7-diaza-spiro f 3.51 nonane hydrochloride (1:1) The title compound, white solid, m.p. 184°C (dec.) and MS: m/e = 325.4 (M+H+) was prepared in accordance with the general method of example 4 from (RS)-7-(octahydro-inden-2-yl)-1-phenyl-1,7-diaza-spiro [3.5]nonan-2-one.
Example 14 7-C cly ooctyl-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) The title compound, m.p. 294°C (dec.) and MS: m/e = 327.3 (M+H+) was prepared in accordance with the general method of example 1 from cyclooctanone and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 15 7-Cyclooct~il-1-phenyl-1.7-diaza-spirof3.51nonane hydrochloride (1:1) The title compound, white solid, m.p. 186°C (dec.) and MS: m/e = 313.3 (M+H+) was prepared in accordance with the general method of example 4 from 7-cyclooctyl-1-phenyl-1,7-diaza-spiro [3.5] nonan-2-one.

Example 16 (RS)-7-(2.3-Dihvdro-1H-phenalen-1- lv )-1-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1).
The title compound, pale brown solid, m.p. 203°C (dec.) and MS: m/e = 383.2 (M+H+) was prepared in accordance with the general method of example as from (RS)-7-(2,3-dihydro-1H-phenalen-1-yl)-piperidine-4-carbonitrile.
Example 17 7-Cvclodecvl-1-phen~~l-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) The title compound, m.p. 260°C (dec.) and MS: m/e = 355.4 (M+H+) was 1o prepared in accordance with the general method of example 1 from cyclodecanone and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 18 (1RS,3aRS)-7-(2.3.3a,4,5.6-Hexahydro-1H-phenalen-1-vl)-1-phenyl-1.7-diaza-spiro f 3.51 nonan-2-one hydrochloride ( 1:1 ) The title compound, white solid, m.p. 232°C (dec.) and MS: m/e = 387.3 (M+H+) was prepared in accordance with the general method of example as from( 1RS,3aRS)-7-(2,3,3a,4,5,6-hexahydro-1H-phenalen-1-yl)-piperidine-4-carbonitrile.
2o Example 19 (1RS 3aSR)-7-(2.3.3a.4,5,6-Hexahydro-1H-phenalen-1-vl)-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) The title compound, white solid, m.p. 162°C and MS: m/e = 387.3 (M+H+) was prepared in accordance with the general method of example as from (1RS,3aSR)-7-(2,3,3a,4,5,6-hexahydro-1H-phenalen-1-yl)-piperidine-4-carbonitrile.

Example 20 7-(Decahydro-azulen-2-yl)-1-phenyl-1.7-diaza-spiro f 3.51nonan-2-one hydrochloride (1:1) (mixture of diastereoisomers) The title compound, white solid, m.p. 334°C (dec.) and MS: m/e = 353.4 (M+H+) was prepared in accordance with the general method of example 1 from decahydro-azulen-2-one and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 21 7-Cvclononyl-1-phenyl-1.7-diaza-spiro(3.51nonan-2-one hydrochloride (1:1) The title compound, white solid, m.p. 249°C (dec.) and MS: m/e = 341.3 (M+H') 1o was prepared in accordance with the general method of example 1 from cyclononanone and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 22 7-(Decahvdro-azulen-2-yl)-1-phenyl-1,7-diaza-spirof3.51nonane hydrochloride 1:1 (mixture of diastereoisomers) The title compound, white solid, m.p. 212°C (dec.) and MS: m/e = 369.3 (M+H+) was prepared in accordance with the general method of example 4 from 7-(decahydro-azulen-2-yl)-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one (mixture of diastereoisomers).
Example 23 2o 7-Cyclonon~phenyl-1.7-diaza-spirof3.51nonane fiunarate (1:2.25) Reduction of 7-cyclononyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 4 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p.
138°C (dec.) and MS: m/e = 327.4 (M+H+).
Example 24 7-Cvclodecvl-1 phenyl-1,7-diaza-spirof3.51nonane fumarate (1:3.1) Reduction of 7-cyclodecyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 4 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p.
141°C (dec.) and MS: m/e = 341.3 (M+H+).
Example 25 7-Cvcloundec~l-1-phenyl-1.7-diaza-spiro[3.51nonan-2-one hvdrochloride (1:1) The title compound, white solid, m.p. 279°C and MS: m/e = 369.4 (M+H+) was prepared in accordance with the general method of example 1 from cycloundecanone and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 26 7-Cycloundecvl-1-phenvl-1.7-diaza-spiro[3.51nonane: fumarate (1:0.78) to Reduction of 7-cycloundecyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 4 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p.
174°C (dec.) and MS: m/e = 355.4 (M+H+).
Example 27 (1RS 3aSR)-7-(2 3 3a.4.5.6-Hexahvdro-1H-phenalen-1-vl)-1-nhenvl-1.7-diaza-spiro [3.51 nonane fumarate ( 1:1 ) Reduction of (1RS,3aSR)-7-(2,3,3a,4,5,6-hexahydro-1H-phenalen-1-yl)-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 4 and treatment of the base with fumaric acid in diethyl ether 2o yielded the title compound, white solid, m.p. 136°C and MS: m/e =
373.4 (M+H+).
Example 28 (1RS 3aRS)-7-(2 3 3a 4 5 6-Hexah~dro-1H-phenalen-1-vl)-1-phenvl-1,7-diaza-spiro[3.51nonane fumarate (1:1) Reduction of (1RS,3aRS)-7-(2,3,3a,4,5,6-hexahydro-1H-phenalen-1-yl)-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 4 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p. 175°C and MS: m/e = 373.4 (M+H+) Example 29 7-Cpclohentvl-1-phenyl-1 7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) The title compound, white solid, m.p. 289°C (dec.) and MS: m/e = 313.2 (M+H+) was prepared in accordance with the general method of example 1 from cycloheptanone and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 30 7-Cycloheptvl-1-phenyl-1 7-diaza-spirof3 5lnonane fumarate (1:1) Reduction of 7-cycloheptyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 4 and treatment of the base to with fumaric acid in diethyl ether yielded the title compound, white solid, m.p.
190°C (dec.) and MS: m/e = 299.4 (M+H+).
Example 31 7-Cyclododecvl-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) The title compound, white solid, m.p. 279°C (dec.) and MS: m/e = 383.3 (M+H+) was prepared in accordance with the general method of example 1 from cyclododecanone and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 32 (RS)-7-Acenaphthen-lyl-1-p-tolvl-1,7-diaza-spirof3.51nonan-2-one fumarate 1:1 2o Reaction of (RS)-4-(p-tolylamino)-1-(acenaphthen-1-yl)-piperidine-4-carbonitrile in accordance with the general method of example as and treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p. 209°C and MS: m1e = 383.3 (M+H+).
Example 33 7-Cyclododecyl-1-phenyl-1.7-diaza-spirof3.51nonane fumarate (1:1) Reduction of 7-cyclododecyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 4 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p.
179°C and MS: m/e = 369.4 (M+H+).

Example 34 ( 1RS 8RS.9SR)-7-Bicyclo f 6.2.01 dec-9-yl-1-phenyl-1.7-diaza-spiro f 3.51 nonan-2-one fumarate (1:1.5) Reaction of (1RS,8RS)-bicyclo[6.2.0]dec-9-one and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 1 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p. 203°C and MS: m/e = 353.4 (M+H').
Example 35 (1RS 8RS.9RS)-7-Bicyclof6.2.Oldec-9-vl-1-1-phenyl-1.7-diaza-spirof3.51nonan-2-to one fumarate (1:1.3) Reaction of (1RS,8RS)-bicyclo[6.2.0]dec-9-one and 1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 1 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, pale brown solid, m.p. 158°C and MS: m/e = 353.4 (M+H+).
Example 36 ( 1RS 8RS 9RS)-7-Bicyclo f 6.2.01 dec-9-vl-1-phenyl-1.7-diaza-spiro f 3.51 nonane fumarate (1:1) Reduction of (1RS,8RS,9RS)-7-Bicyclo[6.2.0]dec-9-yl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one in accordance with the general method of example 4 and 2o treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p. 144°C and MS: m/e = 339.4 (M+H+).
Example 37 (3RS)-2-f 7-(cis-4-Isopropyl-cyclohexvl)-2-oxo-1-phenyl-1.7-diaza-spiro f 3.51non-3-yllisoindole-1.3-dione fumarate (1:1) cis-[1-(4-Isopropyl-cyclohexyl)-piperidin-4-ylidene]phenyl-amine (1.00 g, 3.35 mmol) and triethylamine (678 mg, 6.70 mmol) were dissolved in 50 ml diethylether and 1,3-dihydro-1,3-dioxo-2H-isoindole-2-acetyl chloride (1.5 g, 6.7 mmol) in 10 ml tetrahydrofuran were added at 0°C. The reaction mixture was stirred at room temperature for 24 h. Triethylammonium chloride was 3o filtered off, the filtrate was washed with water, dried with MgS04 and concentrated. Chromatography on silica gel (hexane/ethyl acetate/

triethylamine 40:10:1) gave 551 mg (34 %) of the desired product which was precipitated as its fumarate salt from ether, m.p. 208°C, MS: m/e =
486.3 (M+H+).
Example 38 (3RS)-7-(cis-4-Isopropyl-cyclohexyl)-3-methoxv-1-phenyl-1,7-diaza-s~iro f 3 51 nonan-2-one fumarate ( 1:1 ) The title compound, m.p.148°C and MS: m/e = 371.3 (M+H;) was prepared in accordance with the general method of example 37 from cis-[1-(4-isopropyl-cyclohexyl)-piperidin-4-ylidene]phenyl-amine and methoxy acetyl chloride.
1o Ezaunple 39 (3RS)-3-BenzYloxy-7-(cis-4-isopropyl-cyclohexYl)-1-1-phenyl-1.7-diaza-biro f 3 51 nonan-2-one fumarate ( 1:1 The title compound, m.p.138°C and MS: m/e = 447.3 (M+H+) was prepared in accordance with the general method of example 37 from cis-[1-(4-isopropyl-cyclohexyl)-piperidin-4-ylidene]phenyl-amine and benzyloxy acetyl chloride.
Ezample 40 (RS)-3 3-Bis-hydroxvmethyl-7-(4-methyl-indan-2-yl)-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) The title compound, m.p. >250°C and MS: m/e = 407.4 (M+H+) was prepared 2o in accordance with the general method of example 1 from 1,3-dihydro-4-methyl-2H-inden-2-one and 3,3-bis-hydroxymethyl-1-phenyl-1,7-diaza-spiro [3.5] nonan-2-one.
Ezample 41 3 3-Bis-hydroxymeth~l-?-indan-2-vl-1-phenyl-1.7-diaza-spirof3.51nonan-2-one 2s hydrochloride (1:1) The title compound, m.p. >250°C and MS: m/e = 393.3 (M+H+) was prepared in accordance with the general method of example 1 from 1,3-dihydro-2H-inden-2-one and 3,3-bis-hydroxymethyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.

Example 42 (2RS.4aSR.8aRS)-7-(Decahydro-naphthalen-2-yl)-1 phenyl-1,7-diaza-spiro f 3.51 nonan-2-one hydrochloride ( 1:1 The title compound, m.p. >250°C and MS: m/e = 353.3 (M+H+) was prepared in accordance with the general method of example as from (2RS,4aSR,8aRS)-1-(decahydro-naphthalen-2-yl)-4-phenylamino-piperidine-4-carbonitrile, which was made from (2RS,4aSR,8aRS)-decahydro-naphthalen-2-ylamine in accordance with the general methods of examples ac and ad respectively.
Example 43 (2RS.4aSR,8aRS)-7-(Decahydro-naphthalen-2-yl)-1-phen ~~1-1,7-diaza-spiro f 3. 51 nonane hydrochloride ( 1:1 ) The title compound, m.p. 195-196°C and MS: m/e = 339.4 (M+H+) was prepared in accordance with the general method of example 4 from (2RS,4aSR,8aRS)-7-(decahydro-naphthalen-2-yl)-1-phenyl-1,7-diaza-spiro [3.5]nonan-2-one.
Ezample 44 (3-Hydroxymethyl-7-indan-2-yl-1-phenyl-1, 7-diaza-spiro f 3.51 non-3-vl)-methanol hydrochloride (1:1) 3,3-Bis-hydroxymethyl-7-indan-2-yl-1-phenyl-1,7-diazaspiro [3.5]nonan-2-one, obtained in example 41, (110 mg, 0. 28 mmol) dissolved in diethylether (6 ml) and tetrahydrofurane (8 ml) was added at room temperature to a mixture of lithium aluminiumhydride (55 mg) and aluminium trichloride (190 mg) in diethylether (20 ml). The mixture was boiled for 1 h with stirring, cooled and quenched with water (7 ml). Extraction with dichloromethane, drying with Na2S04 and evaporation of solvents yielded 55 mg (52%) of the title compound which was crystallized as its HCl salt from ethylacetate, m.p. > 140°C
dec., MS: m/e = 379.4 (M+H+).
Example 45 3 3-Bis-hydroxvmethyl-7-(cis-4-isopropyl-cvclohexyl)-1-1-phenyl-1.7-diaza-3o s~irof3.51nonan-2-one hydrochloride (1:1) The title compound, m.p. >245°C dec. and MS: m/e = 401.5 (M+H') was prepared in accordance with the general method of example 1 from 4-isopropyl-cyclohexanone and 3,3-bis-hydroxymethyl-1-phenyl-1,7-diazaspiro[3.5]nonan-2-one and separated from the traps-stereoisomer by chromatography on silica gel with dichloromethane/methanol 6%.
Example 46 (RS)-7-(2-Oxo-1,2-diphen~vl)-1-phenyl-1, 7-diaza-spiro f 3.51 nonan-2-one A suspension of 2-chloro-1,2-diphenyl-ethanone (0.23 g, 1 mmol), 1-phenyl-1,7 diazaspiro[3.5]nonan-2-one (0.2 g, 0.9 mmol) and sodium bicarbonate (0.23 g) to in 2-butanone was boiled for 4 h with stirring. The mixture was cooled, the solvent was removed in vacuo and the residue was purified by chromatography on silica gel with ethylacetate/hexane (1:2) to yield 0.33 g (87%) of the title compound. MS: m/e = 411.3 (M+H+).
Example 47 Mixture of f3-hydroxymethvl-7-(cis- and -(traps-4-isopropyl-cyclohexyl)-1-phenvl-1,7-diaza-spirof3.51non-3-yll-methanol hydrochloride (1:1) The title compound, m.p. >126°C dec. and MS: m/e = 387.3 (M+H+) was prepared in accordance with the general method of example 44 from 3,3-bis-2o hydroxymethyl-7-(4-isopropyl-cyclohexyl)-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 48 (RS)-f 3-Hydroxymethvl-7-(4-methyl-indan-2-vl)-1-phenyl-1,7-diaza-spirof3.51non-3-vll-methanol hydrochloride (1:1) The title compound, m.p. >154°C dec. and MS: m/e = 393.3 (M+H+) was prepared in accordance with the general method of example 44 from 3,3-bis-hydroxymethyl-7-(4-methyl-indan-2-yl)-1-phenyl-1, 7-diaza-spiro [3.5] nonan-2-one.

Example 49 Mixture of (RS)- and (SR)-3-hvdroxymethyl-7-f(RS)-4-methyl-indan-2-vll-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) The title compound, m.p. >250°C dec. and MS: m/e = 377.3 (M+H+) was prepared in accordance with the general method of example 1 from 4-methyl-indan-2-one and 3-hydroxymethyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one.
Example 50 l0 (RS)-3-Hydroxvmethyl-7-(traps-4-isopropyl-cvclohexvl)-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) The title compound, m.p. 218-222°C and MS: m/e = 371.3 (M+H+) was prepared in accordance with the general method of example 1 from 4-isopropyl-cyclohexanone and 3-hydroxymethyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one and separated from the cis-stereoisomer by chromatography on silica gel with dichloromethane/methanol 2%.
Example 51 (RS)-7-Acenaphthen-1-yl-1-(3-fluoro-phenyl)-1, 7-diaza-spiro f 3.51 nonan-2-one fumarate (1:1) Reaction of (RS)-4-(3-fluoro-phenylamino)-1-(acenaphthen-1-yl)-piperidine-4-carbonitrile in accordance with the general method of example 1 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p. 230°C and MS: m/e = 387.3 (M+H+).
Example 52 (RS)-7-Acenaphthen-1-yl-1-(4-chloro-phenyl)-1, 7-diaza-spiro f 3.51 nonan-2-one fumarate (1:0.75) Reaction of (RS)-4-(4-chloro-phenylamino)-1-(acenaphthen-1-yl)-piperidine-4-carbonitrile in accordance with the general method of example 1 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, pale brown solid, m.p. 196°C and MS: m/e = 403.3 (M+H+).
Example 53 (RS)-7-Acenaphthen-1-vl-1-(3-chloro-phenyl)-1.7-diaza-spiro f 3.51nonan-2-one fumarate (1:1) Reaction of (RS)-4-(3-chloro-phenylamino)-1-(acenaphthen-1-yl)-piperidine-4-carbonitrile in accordance with the general method of example 1 and treatment of the base with fumaric acid in diethyl ether yielded the title 1o compound, white solid, m.p. 214°C and MS: m/e = 403.4 (M+H+) Example 54 SRS)-7-Acenaphthen-1-vl-1-(4-fluoro-phenyl)-1,7-diaza-spiro f 3.51nonan-2-one fumarate ( 1:1 ) Reaction of (RS)-4-(4-fluoro-phenylamino)-1-(acenaphthen-1-yl)-piperidine-4-carbonitrile in accordance with the general method of example 1 and treatment of the base with fumaric acid in diethyl ether yielded the title compound, white solid, m.p. 210°C and MS: m/e = 387.2 (M+H+).
2o Syntheses of intermediates Example as 7-Benzyl-1-phenyl-1.7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) Methyl bromoacetate (136 mmol) was added dropwise to a refluxing suspension of 4-(phenylamino)-1-(phenylmethyl)-4-piperidinecarbonitrile (34 mmol) and zinc (170 mmol). The mixture was heated for 1 1/a h after addition was complete, cooled and potassium carbonate solution (50%, 45 ml) was added. The two-phase mixture was filtered through Celite , the phases were separated and the water phase extracted with THF. Organic phases were pooled, dried with MgS04 and concentrated. Filtration through silica gel (methylenchloride/methanol, 98:2) yielded the desired product (9.1 g, 87%) which was crystallized as its HCl-salt from ethyl acetate/ethanol. 7-Benzyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one hydrochloride (1:1) was isolated as a colorless solid, m.p. > 250°C and MS: m/e = 307.2 (M+H+).
Example ab 1-Phenyl-1.7-diaza-spirof3.51nonan-2-one hydrochloride (1:1) 7-Benzyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one (17 mmol) was dissolved in methanol (300 ml). Palladium on carbon (10%, 0.3 g) was added and the mixture was hydrogenated at room temperature and normal pressure.
Filtration and evaporation yielded the desired product which was crystallized as its HCl-salt from ethyl acetate/ethanol. 3.5 g (81%) 1-phenyl-1,7-diaza-to spiro[3.5]nonan-2-one hydrochloride (1:1) as a colorless solid, m.p.
>250°C and MS: m/e = 216 (M ').
Example ac 1-Bicyclo [3 .3.11 non-9-vl-piperidin-4-one 1-Bicyclo[3.3.1]non-9-ylamine (2.26 g, 16.2 mmol) was dissolved in ethanol (40 ml). Potassium carbonate (224 mg, 1.62 mmol) and 1-ethyl-1-methyl-4-oxo-piperidinium iodide (6 g, 22.4 mmol) dissolved in water (15 ml) were added and the mixture was refluxed for 75 min. Water (100 ml) was added, ethanol was removed in vacuo and the residue was extracted with ethyl acetate (2 x 100 ml). The combined organic phases were washed with brine (100 ml), dried (MgS04) and evaporated. Column chromatography on silica gel (toluene%thyl acetate 4:1) yielded the desired product (2.99 g, 83%) as a pale yellow oil, MS:
m/e = 221 (M+).
Example ad 1-Bicyclo~3.3.11non-9 yl-4-phenylamino-piperidine-4-carbonitrile 1-Bicyclo[3.3.1]non-9-yl-piperidin-4-one (2.99 g, 13.5 mmol) was dissolved in acetic acid (15 ml). Aniline (1.36 ml, 14.9 mmol) and trimethylsilylcyanide (1.44 ml, 13.5 mmol) were added at 0°C and the mixture was stirred for 17 h at room temperature. The reaction mixture was poured into cold ammonia solution (water/28% ammonia, 30m1/50m1) and extracted with 3o dichloromethane (2 x 100 ml). The combined organic phases were washed with brine (100 ml), dried (MgS04) and concentrated. Column chromatography on silica gel (toluene/ethyl acetate 4:1) yielded the desired product (3.18 g, 73%) as a pale yellow solid, m.p. 168°C, MS: m/e = 324.4 (M+H+).

Example ae cis-f 1-(4-Isopropyl-cyclohexyl)-piperidin-4-ylidene]phenyl-amine cis-1-(4-Isopropyl-cyclohexyl)-piperidine-4-on (5.0 g, 23.4 mmol), pyridine (3.3 g, 35.3 mmol) and molecular sieves (20 g, 4E~r) were stirred in 100 ml pentane at room temperature for 6 days. The molecular sieves were filtered off and the solvent was evaporated. The crude product was used without any further purification for the following steps.
Example of 7-Benzvl-3.3-bis-hydroxymethvl-1-phenyl-1.7-diaza-spiro f 3.51 nonan-2-one to ~drochloride (1:1) A solution of 7-benzyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one (0.7 mmol) in THF (4 ml) was added to a solution of lithiumdiisopropylamide (2 mmol) and N,N,N'N'-tetramethylethylendiamine (2 mmol) in THF (5 ml) at -75°C. The mixture was stirred for 1 h at -78°C, gaseous formaldehyde was bubbled 15 through the mixture for 5 min and stirring was continued for another hour.
The reaction was quenched with saturated sodiumbicarbonate solution (30 ml) and extracted with dichloromethane. Organic phases were pooled, dried with Na2S04 and concentrated. Chromatography on silica gel (dichloromethane/methanol, 50:1) yielded the desired product which was 2o crystallized as its HCl-salt from ethanol/ethyl.acetate. 65 mg (25%) 7-benzyl-3,3-bis-hydroxymethyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one hydrochloride (1:1) as a colorless solid , m.p. >250°C and MS: m/e = 367.2 (M++H).
Example ag (RS)-7-Benzyl-3-hydroxymethyl-1-phenyl-1.7-diaza-spiro f 3.51nonan-2-one 25 hydrochloride (1:1) The title compound, m.p. >117°C dec. and MS: m/e = 337.2 (M+H+) was prepared as byproduct of example af. 60 mg (25%) (RS)-7-benzyl-3-hydroxymethyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one hydrochloride (1:1) as a colorless solid, m.p. >117°C dec. and MS: m/e = 337.2 (M++H).

Example ah 3.3-Bis-hydroxvmethyl-1-phenyl-1,7-diaza-spirof3.51nonan-2-one hydrochloride 1:1 The title compound, m.p. >250°C and MS: m/e = 277.2 (M+H+) was prepared in accordance with the general method of example ab from 7-benzyl-3,3-bis-hydroxymethyl-1-phenyl-1,7-diaza-spiro [3.5)nonan-2-one.
Example ai SRS )-3-Hydroxymethyl-1-phenyl-1, 7-diaza-spiro f 3.51 nonan-2-one The title compound, a yellow oil, MS: m/e = 247.3 (M+H+) was prepared in accordance to with the general method of example ah from (RS)-7-benzyl-3-hydroxymethyl-1-phenyl 1,7-diaza-spiro[3.5]nonan-2-one.
Example A
Tablets of the following composition are manufactured in the usual manner:
mg/tablet Active substance 5 Lactose 45 Corn starch 15 2o Microcrystalline cellulose 34 Magnesium stearate 1 Tablet weight 100 Example B
Capsules of the following composition are manufactured:
m~psule Active substance 10 Lactose 155 Corn starch 30 Talc 5 Capsule fill weight 200 The active substance, lactose and corn starch are firstly mixed in a mixer and then in a comminuting machine. The mixture is returned to the mixer, the talc is added thereto and mixed thoroughly. The mixture is filled by machine into hard gelatine capsules.
Example C
Suppositories of the following composition are manufactured:
m~/supn.
l0 Active substance 15 Suppository mass 1285 Total 1300 The suppository mass is melted in a glass or steel vessel, mixed thoroughly and cooled to 45°C. Thereupon, the finely powdered active substance is added thereto and stirred until it has dispersed completely. The mixture is poured into suppository moulds of suitable size, left to cool, the suppositories are then removed from the moulds and packed individually in wax paper or metal foil.

Claims (8)

1. Compounds of the general formula wherein R1 is C6-12-cycloalkyl, optionally substituted by lower alkyl or C(O)O lower alkyl, indan-1-yl or indan-2-yl, optionally substituted by lower alkyl;
acenaphthen-1-yl; bicyclo[3.3.1]non-9-yl, octahydro-inden-2-yl;

2,3-dihydro-1H-phenalen-1-yl; 2,3,3a,4,5,6-hexahydro-1H-phenalen-1-yl, decahydro-azulen-2-yl; bicyclo[6.2.0]dec-9-yl; decahydro-naphthalen-1-yl, decahydro-naphthalen-2-yl; tetrahydro-naphthalen-1-yl, tetrahydro-naphthalen-2-yl or 2-oxo-1,2-diphenyl-ethyl;
R2 is =O or hydrogen, R3 is hydrogen, isoindolyl-1,3-dione, lower alkoxy, lower alkyl, amino, benzyloxy, -CH2OR5 or -CH2N(R5)2;
R4 is hydrogen or -CH2OR5;
R5 is hydrogen or lower alkyl;
A is cyclohexyl or phenyl, optionally substituted by lower alkyl, halogen or alkoxy;
racemic mixtures and their corresponding enantiomers and pharmaceutically acceptable acid addition salts thereof.

2. A compound according to claim 1, wherein R1 is C6-9-cycloalkyl or decahydro-naphthalen-2-yl.

3. A compound according to claim 2, which is 3,3-bis-hydroxymethyl-7-(cis-4-isopropyl-cyclohexyl)-1-phenyl-1,7-diaza-spiro-[3.5]nonane-2-one;

7-(cis-4-isopropyl-cyclohexyl)-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one;
7-(cis-4-isopropyl-cyclohexyl)-1-phenyl-1,7-diaza-spiro[3.5]nonane;
7-cyclononyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one;
7-cyclononyl-1-phenyl-1,7-diaza-spiro[3.5]nonane;
7-cyclooctyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one;
cycloheptyl-1-phenyl-1,7-diaza-spiro[3.5]nonan-2-one and (2RS,4aSR,8aRS)-7-(decahydro-naphthalen-2-yl)-1-phenyl-1,7-diaza-spiro(3.5]nonan-2-one.

4. A medicament containing one or more compounds as claimed in any one of claims 1-3 and pharmaceutically acceptable excipients.

5. A medicament according to claim 4 for the treatment of diseases related to the orphanin FQ(OFQ) receptor, which include psychiatric, neurological and physiological disorders, such as anxiety and stress disorders, depression, trauma, memory loss due to Alzheimer's disease or other dementias, epilepsy and convulsions, acute and/or chronic pain conditions, and symptoms of addictive drug withdrawal, control of water balance, Na+
excretions, arterial blood pressure disorders and metabolic disorders such as obesity.

6. A process for preparing a compound of formula I as defined in claim 1, which process comprises reductively aminating a compound of formula with a compound of formula wherein R1, R2, R3, R4 and A have the significances given in claim 1, and, if desired, converting a racemic mixture into its enantiomeric components thus obtaining optically pure compounds, and/or converting the compounds obtained into pharmaceutically acceptable acid addition salts.

7. A compound according to any one of claims 1-3, whenever prepared by the process as claimed in claim 6 or by an equivalent method.

8. The use of a compound claimed in any one of claims 1-3 for the treatment of diseases related to the orphanin FQ(OFQ) receptor, which include psychiatric, neurological and physiological disorders, such as anxiety and stress disorders, depression, trauma, memory loss due to Alzheimer's disease or other demential, epilepsy and convulsions, acute and/or chronic pain conditions, and symptoms of addictive drug withdrawal, control of water balance, Na+ excretion, arterial blood pressure disorders and metabolic disorders such as obesity or for the manufacture of a medicament useful in the treatment of diseases.