SPIROAZACYCLIC COMPOUNDS AS MONOAMINE RECEPTOR MODULATORS

• US 20070161621A1
• Filed: 03/16/2007
• Published: 07/12/2007
• Est. Priority Date: 12/28/2001
• Status: Active Grant

• Current Assignee: Acadia Pharmaceuticals Inc.
• Original Assignee: Acadia Pharmaceuticals Inc.
• Inventors: Schlienger, Nathalie
• Granted Patent: US 7,511,053 B2
• Time in Patent Office: Days
• US Class Current: 514/211.50
• CPC Class Codes: A61P 1/14 Prodigestives, e.g. acids, enzymes, appetite stimulants, antidyspeptics, tonics, antiflatulents
• CPC Class Codes: A61P 25/00 Drugs for disorders of the nervous system
• CPC Class Codes: A61P 25/06 Antimigraine agents
• CPC Class Codes: A61P 25/14 for treating abnormal movements, e.g. chorea, dyskinesia
• CPC Class Codes: A61P 25/16 Anti-Parkinson drugs
• CPC Class Codes: A61P 25/18 Antipsychotics, i.e. neuroleptics; Drugs for mania or schizophrenia
• CPC Class Codes: A61P 25/20 Hypnotics; Sedatives
• CPC Class Codes: A61P 25/22 Anxiolytics
• CPC Class Codes: A61P 25/24 Antidepressants
• CPC Class Codes: A61P 25/28 for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
• CPC Class Codes: A61P 25/32 Alcohol-abuse
• CPC Class Codes: A61P 3/04 Anorexiants; Antiobesity agents
• CPC Class Codes: A61P 43/00 Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• CPC Class Codes: A61P 7/02 Antithrombotic agents; Anticoagulants; Platelet aggregation inhibitors
• CPC Class Codes: A61P 9/00 Drugs for disorders of the cardiovascular system
• CPC Class Codes: A61P 9/08 Vasodilators for multiple indications
• CPC Class Codes: A61P 9/10 for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
• CPC Class Codes: A61P 9/12 Antihypertensives
• CPC Class Codes: C07D 471/10 Spiro-condensed systems
• CPC Class Codes: C07D 491/10 Spiro-condensed systems
• CPC Class Codes: C07D 498/10 : Spiro-condensed systems

Abstract

The present invention relates to spiroazacyclic compounds as monoamine receptor modulators; compositions comprising the same; methods of inhibiting an activity of a monoamine receptor with said compounds; methods of treating a disease condition associated with a monoamine receptor using said compounds; and methods for identifying a subject suitable for treatment using said compounds.

Claims

1. A compound of formula I, salts and stereoisomers thereof:

2. The compound of claim 1, wherein R¹ is selected from the group consisting of C_1-6 alkyl, C_2-8 alkenyl, C_2-8 alkynyl, C_3-8 cycloalkyl, aryl, and heteroaryl.

3. The compound of claim 1, wherein Y is O.

4. The compound of claim 1, wherein Z is CH and m is zero.

5. The compound of claim 1, wherein m is zero.

6. The compound of claim 1, wherein the compound is homochiral to the compound of Formula II.

7. The compound of claim 1, wherein at least two of R⁴, R⁵, and R⁶ are independently selected from the group consisting of aryl(C_1-16 alkyl) and heteroaryl(C_1-6 alkyl).

8. The compound of claim 7, wherein two of R⁴, R⁵, and R⁶ are independently selected from the group consisting of aryl(C_1-16 alkyl) and heteroaryl(C_1-6 alkyl) and the remaining one of R⁴, R⁵, and R⁶, if present, is hydrogen.

9. The compound according of claim 1, wherein said aryl(C_1-16 alkyl) is (4-substituted)-aryl(C_1-6 alkyl).

10. The compound of claim 8, wherein at least one of R⁴, R⁵, and R⁶ is selected from the group consisting of fluoro-substituted-aryl(C_1-6 alkyl), and fluoro-substituted-heteroaryl(C_1-6 alkyl).

11. The compound of claim 1, wherein the at least two of R⁴, R⁵, and R⁶ independently selected from the group consisting of aryl(C_1-6 alkyl), heteroaryl(C_1-6 alkyl), and heterocyclyl(C_1-6 alkyl), are independently substituted 1, 2, or 3 times with a substituent independently selected from the group consisting of halogen and optionally substituted O—

C_1-6-alkyl.

12. The compound of claim 11, wherein the halogen is fluorine and the optionally substituted O—

C_1-6-alkyl is an unsubstituted or fluorinated O—

C_1-6-alkyl.

13. The compound of claim 1, wherein at least two of R⁴, R⁵, and R⁶ are an optionally substituted aryl(C_1-6 alkyl).

14. The compound of claim 13, wherein at least two of R⁴, R⁵, and R⁶ are optionally substituted benzyl.

15. The compound of claim 1, wherein the compound of formula I is selected from the group consisting of (i) optionally substituted 1-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

(ii) optionally substituted 1,3,8-triaza-spiro[4.5]decan-2-one;

(iii) optionally substituted 1,2,9-triaza-spiro[5.5]undecan-3-one;

(iv) optionally substituted 1,2,8-triaza-spiro[4.5]decan-3-one;

(v) optionally substituted 1,2,4,8-tetraaza-spiro[4.5]decan-3-one;

(vi) optionally substituted 2,4,9-triaza-spiro[5.5]undecan-3-one;

(vii) optionally substituted 2,8-diaza-spiro[4.5]decan-3-one (viii) optionally substituted 2-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

(ix) optionally substituted 1-thia-3,8-diaza-spiro[4.5]decan-2-one; and

(x) optionally substituted 1-oxa-3,9-diaza-spiro[5.5]undecan-2-one.

16. The compound of claim 15 selected from the group consisting of:

4-(4-Fluorobenzyl)-3-(4-methoxybenzyl)-8-methyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Ethoxybenzyl)-4-(4-fluorobenzyl)-8-methyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-8-methyl-3-(4-propoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Cyclopropylmethoxybenzyl)-4-(4-fluorobenzyl)-8-methyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-isopropoxybenzyl)-8-methyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Butoxybenzyl)-4-(4-fluorobenzyl)-8-methyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-methyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Difluoromethoxybenzyl)-4-(4-fluorobenzyl)-8-methyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-8-methyl-3-(4-trifluoromethoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-8-methyl-3-(4-pentoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Ethyl-4-(4-fluorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-isopropyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclopentyl-4-(4-fluorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-(3-morpholin-4-yl-propyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-(2-[1,3]Dioxolan-2-yl-ethyl)-4-(4-fluorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-[2-(2-oxo-imidazolidin-1-yl)-ethyl]-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-[3-(2-oxo-2,3-dihydro-benzoimidazol-1-yl)-propyl]-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-(2-methyl-thiazol-4-yl-methyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Chlorobenzyl)-3-(4-isobutoxybenzyl)-8-methyl-1-oxa-3,8-diaza-spiro [4.5]decan-2-one;

8-Ethyl-4-(4-chlorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Chlorobenzyl)-3-(4-isobutoxybenzyl)-8-isopropyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-(2-[1,3]Dioxolan-2-yl-ethyl)-4-(4-chlorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Chlorobenzyl)-3-(4-isobutoxybenzyl)-8-[2-(2-oxo-imidazolidin-1-yl)-ethyl]-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Difluoromethoxybenzyl)-4-(4-fluorobenzyl)-8-methyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Difluoromethoxybenzyl)-8-ethyl-4-(4-fluorobenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Difluoromethoxybenzyl)-4-(4-fluorobenzyl)-8-isopropyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Difluoromethoxybenzyl)-8-(2-[1,3]dioxolan-2-yl-ethyl)-4-(4-fluorobenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Difluoromethoxybenzyl)-4-(4-fluorobenzyl)-8-[2-(2-oxo-imidazolidin-1-yl)-ethyl]-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Ethyl-4-(4-fluorobenzyl)-3-(4-trifluoromethoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-8-isopropyl-3-(4-trifluoromethoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclopentyl-4-(4-fluorobenzyl)-3-(4-trifluoromethoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-(2-[1,3]Dioxolan-2-yl-ethyl)-4-(4-fluorobenzyl)-3-(4-trifluoromethoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-8-[2-(2-oxo-imidazolidin-1-yl)-ethyl]-3-(4-trifluoromethoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Ethyl-4-(4-fluorobenzyl)-3-(4-propoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-8-isopropyl-3-(4-propoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclopentyl-4-(4-fluorobenzyl)-3-(4-propoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-(2-[1,3]Dioxolan-2-yl-ethyl)-4-(4-fluorobenzyl)-3-(4-propoxybenzyl)-1-oxa-3,8-diaza-spiro [4.5]decan-2-one;

4-(4-Fluorobenzyl)-8-[2-(2-oxo-imidazolidin-1-yl)-ethyl]-3-(4-propoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Cyclopropylmethoxybenzyl)-8-ethyl-4-(4-fluorobenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Cyclopropylmethoxybenzyl)-4-(4-fluorobenzyl)-8-isopropyl-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Cyclopropylmethoxybenzyl)-8-(2-[1,3]dioxolan-2-yl-ethyl)-4-(4-fluorobenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Cyclopropylmethoxybenzyl)-4-(4-fluorobenzyl)-8-[2-(2-oxo-imidazolidin-1-yl)-ethyl]-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-(2-[1.3]-Dioxan-2-yl-ethyl)-4-(4-fluorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decane-2-one;

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-{3-[(S)-4-isopropyl-2-oxo-oxazolidin-3-yl]-propyl}-1-oxa-3,8-diaza-spiro[4.5]decane-2-one;

8-Methyl-4-(4-methylbenzyl)-3-(4-trifluoromethoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

3-(4-Methoxybenzyl)-8-methyl-4-(4-methylbenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

1-(4-Fluorobenzyl)-2-(4-methoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

2-(4-Ethoxybenzyl)-1-(4-fluorobenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Fluorobenzyl)-8-methyl-2-(4-propoxybenzyl)-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Fluorobenzyl)-2-(4-isopropoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

2-(4-Butoxybenzyl)-1-(4-fluorobenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

2-(4-Cyclopropylmethoxybenzyl)-1-(4-fluorobenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Fluorobenzyl)-2-(4-isobutoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

2-(4-Difluoromethoxybenzyl)-1-(4-fluorobenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Fluorobenzyl)-8-methyl-2-(4-trifluoromethoxybenzyl)-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Fluorobenzyl)-8-methyl-2-(4-pentoxybenzyl)-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Chlorobenzyl)-2-(4-ethoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Chlorobenzyl)-8-methyl-2-(4-propoxybenzyl)-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Chlorobenzyl)-2-(4-isobutoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Chlorobenzyl)-2-(4-cyclopropylmethoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Chlorobenzyl)-2-(4-difluoromethoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Ethylbenzyl)-2-(4-ethoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Ethylbenzyl)-2-(4-isopropoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Ethylbenzyl)-2-(4-isobutoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Ethylbenzyl)-2-(4-cyclopropylmethoxybenzyl)-8-methyl-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Ethylbenzyl)-8-methyl-2-(4-trifluoromethoxybenzyl)-1,2,8-triaza-spiro[4.5]decan-3-one;

2-(4-Difluoromethoxybenzyl)-1-(4-fluorobenzyl)-8-ethyl-1,2,8-triaza-spiro[4.5]decan-3-one;

2-(4-Difluoromethoxybenzyl)-1-(4-fluorobenzyl)-8-isopropyl-1,2,8-triaza-spiro[4.5]decan-3-one;

2-(4-Difluoromethoxybenzyl)-1-(4-fluorobenzyl)-8-(2-[1,3]dioxolan-2-yl-ethyl)-1,2,8-triaza-spiro[4.5]decan-3-one;

8-Ethyl-1-(4-fluorobenzyl)-2-(4-isobutoxybenzyl)-1,2,8-triaza-spiro[4.5]decan-3-one;

1-(4-Fluorobenzyl)-2-(4-isobutoxybenzyl)-8-isopropyl-1,2,8-triaza-spiro [4.5]decan-3-one;

8-(2-[1,3]dioxolan-2-yl-ethyl)-1-(4-fluorobenzyl)-2-(4-isobutoxybenzyl)-1,2,8-triaza-spiro[4.5]decan-3-one;

4-(4-Ethoxybenzyl)-5-(4-fluorobenzyl)-9-methyl-1-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

5-(4-Fluorobenzyl)-9-methyl-4-(4-propoxybenzyl)-1-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

5-(4-fluorobenzyl)-4-(4-isobutoxybenzyl)-9-methyl-1-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

5-(4-fluorobenzyl)-9-methyl-4-(4-trifluoromethoxybenzyl)-1-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

5-(4-Chlorobenzyl)-4-(4-isobutoxybenzyl)-9-methyl-1-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

5-(4-Chlorobenzyl)-4-(4-cyclopropylmethoxybenzyl)-9-methyl-1-oxa-4,9-diaza-spiro [5.5]undecan-3-one;

9-Ethyl-5-(4-fluorobenzyl)-4-(4-propoxybenzyl)-1-oxa-4,9-diaza-spiro [5.5]undecan-3-one;

1-(4-Fluorobenzyl)-2-(4-ethoxybenzyl)-9-methyl-1,2,9-triaza-spiro[5.5]undecan-3-one;

1-(4-Fluorobenzyl)-2-(4-cyclopropylmethoxybenzyl)-9-methyl-1,2,9-triaza-spiro[5.5]undecan-3-one;

1-(4-Fluorobenzyl)-2-(4-isobutoxybenzyl)-9-methyl-1,2,9-triaza-spiro[5.5]undecan-3-one;

1-(4-Fluorobenzyl)-2-(4-propoxybenzyl)-9-methyl-1,2,9-triaza-spiro[5.5]undecan-3-one;

1-(4-Ethylbenzyl)-2-(4-isobutoxybenzyl)-9-methyl-1,2,9-triaza-spiro[5.5]undecan-3-one;

1-(4-Fluorobenzyl)-2-(4-cyclopropylmethoxybenzyl)-9-ethyl-1,2,9-triaza-spiro[5.5]undecan-3-one;

2-(4-Ethoxybenzyl)-1-(4-fluorobenzyl)-8-methyl-1,2,4,8-tetraaza-spiro[4.5]decan-3-one;

1-(4-Fluorobenzyl)-2-(4-isobutoxybenzyl)-8-methyl-1,2,4,8-tetraaza-spiro[4.5]decan-3-one;

2-(4-Difluoromethoxybenzyl)-1-(4-fluorobenzyl)-8-methyl-2,8-diaza-spiro[4.5]decan-3-one;

1-(4-Fluorobenzyl)-2-(4-isobutoxybenzyl)-8-methyl-2,8-diaza-spiro[4.5]decan-3-one;

2-(4-Cyclopropylmethoxybenzyl)-1-(4-fluorobenzyl)-8-methyl-2,8-diaza-spiro[4.5]decan-3-one;

8-Ethyl-1-(4-fluorobenzyl)-2-(4-isobutoxybenzyl)-2,8-diaza-spiro[4.5]decan-3-one;

8-(2-[1,3]Dioxolan-2-yl-ethyl)-1-(4-fluorobenzyl)-2-(4-isobutoxybenzyl)-2,8-diaza-spiro[4.5]decan-3-one;

3-(4-Difluoromethoxybenzyl)-4-(4-fluorobenzyl)-8-methyl-1,3,8-triaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-methyl-1,3,8-triaza-spiro[4.5]decan-2-one;

3-(4-Cyclopropylmethoxybenzyl)-4-(4-fluorobenzyl)-8-methyl-1,3,8-triaza-spiro[4.5]decan-2-one;

8-Ethyl-4-(4-fluorobenzyl)-3-(4-isobutoxybenzyl)-1,3,8-triaza-spiro[4.5]decan-2-one;

8-(2-[1,3]Dioxolan-2-yl-ethyl)-4-(4-fluorobenzyl)-3-(4-isobutoxybenzyl)-1,3,8-triaza-spiro[4.5]decan-2-one;

1-(4-Fluorobenzyl)-2-(4-ethoxybenzyl)-9-methyl-2,4,9-triaza-spiro[5.5]undecan-3-one;

1-(4-Fluorobenzyl)-2-(4-cyclopropylmethoxybenzyl)-9-methyl-2,4,9-triaza-spiro[5.5]undecan-3-one;

1-(4-Fluorobenzyl)-2-(4-isobutoxybenzyl)-9-methyl-2,4,9-triaza-spiro[5.5]undecan-3-one;

1-(4-Fluorobenzyl)-2-(4-trifluoromethoxybenzyl)-9-methyl-2,4,9-triaza-spiro[5.5]undecan-3-one;

1-(4-Fluorobenzyl)-2-(4-isobutoxybenzyl)-9-ethyl-2,4,9-triaza-spiro[5.5]undecan-3-one;

4-(4-Ethoxybenzyl)-5-(4-fluorobenzyl)-9-methyl-1-oxa-3,9-diaza-spiro[5.5]undecan-2-one;

3-(4-Ethoxybenzyl)-5-(4-fluorobenzyl)-9-methyl-1-oxa-3,9-diaza-spiro[5.5]undecan-2-one;

3-(4-Ethoxybenzyl)-4-(4-fluorobenzyl)-9-methyl-1-oxa-3,9-diaza-spiro[5.5]undecan-2-one;

5-(4-Fluorobenzyl)-4-(4-propoxybenzyl)-9-methyl-1-oxa-3,9-diaza-spiro[5.5]undecan-2-one;

5-(4-Fluorobenzyl)-3-(4-propoxybenzyl)-9-methyl-1-oxa-3,9-diaza-spiro[5.5]undecan-2-one;

4-(4-Fluorobenzyl)-3-(4-propoxybenzyl)-9-methyl-1-oxa-3,9-diaza-spiro[5.5]undecan-2-one;

5-(4-Fluorobenzyl)-4-(4-isobutoxybenzyl)-9-methyl-1-oxa-3,9-diaza-spiro[5.5]undecan-2-one;

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-9-methyl-1-oxa-3,9-diaza-spiro[5.5]undecan-2-one;

4-(4-Ethoxybenzyl)-5-(4-fluorobenzyl)-9-methyl-2-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

5-(4-Fluorobenzyl)-4-(4-methoxybenzyl)-9-methyl-2-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

5-(4-Fluorobenzyl)-4-(4-propoxybenzyl)-9-methyl-2-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

5-(4-Fluorobenzyl)-4-(4-isobutoxybenzyl)-9-methyl-2-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

4-(4-Ethoxybenzyl)-5-(4-fluorobenzyl)-9-methyl-2-oxa-4,9-diaza-spiro[5.5]undecan-3-one;

3-(4-Ethoxybenzyl)-4-(4-fluorobenzyl)-8-methyl-1-thia-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-methoxybenzyl)-8-methyl-1-thia-3,8-diaza-spiro[4.5]decan-2-one;

4-(4-Fluorobenzyl)-3-(4-propoxybenzyl)-8-methyl-1-thia-3,8-diaza-spiro[4.5]decan-2-one; and

4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-methyl-1-thia-3,8-diaza-spiro[4.5]decan-2-one.

18. A composition comprising:

i) one or more compounds of formula I, according to claim 1;

and

ii) at least one pharmaceutically acceptable excipient or carrier.

19. A method of inhibiting an activity of a monoamine receptor comprising contacting the monoamine receptor or a system containing the monoamine receptor with an effective amount of one or more of the compounds according to claim 1.

20. A method of inhibiting an activation of a serotonin receptor, the method comprising contacting the serotonin receptor or a system containing the serotonin receptor with an effective amount of one or more of the compounds according to claim 1.

21. A method of treating a disease condition associated with a monoamine receptor comprising administering to a subject in need of such treatment a therapeutically effective amount of one or more of the compounds of claim 1.

17. A compound selected from the group consisting of:

8-Cyclopropylmethyl-4-(4-fluorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro [4.5]decan-2-one;

8-Cyclohexylmethyl-4-(4-fluorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclopropylmethyl-4-(4-chlorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclohexylmethyl-4-(4-chlorobenzyl)-3-(4-isobutoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclopropylmethyl-3-(4-difluoromethoxybenzyl)-4-(4-fluorobenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclohexylmethyl-3-(4-difluoromethoxybenzyl)-4-(4-fluorobenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclopropylmethyl-4-(4-fluorobenzyl)-3-(4-trifluoromethoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclohexylmethyl-4-(4-fluorobenzyl)-3-(4-trifluoromethoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclopropylmethyl-4-(4-fluorobenzyl)-3-(4-propoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclohexylmethyl-4-(4-fluorobenzyl)-3-(4-propoxybenzyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one;

8-Cyclopropylmethyl-1-(4-fluorobenzyl)-2-(4-isobutoxybenzyl)-1,2,8-triaza-spiro[4.5]decan-3-one;

2-(4-Difluoromethoxybenzyl)-1-(4-fluorobenzyl)-8-cyclopropylmethyl-1,2,8-triaza-spiro[4.5]decan-3-one; and

8-Cyclopropylmethyl-1-(4-fluorobenzyl)-2-(4-isobutoxybenzyl)-1,2,8-triaza-spiro[4.5]decan-3-one.