Renin inhibitors

1. A compound of formula I,

or a pharmaceutically acceptable salt thereof, or an optical isomer thereof, wherein

X is N or CH;

Y is O, CH 2 , or a bond;

R 1 is

—(CH 2 ) 1-3 OR 4 , or

—O(CH 2 ) 1-2 OR 4 ;

R 2 is selected from the group consisting of

—(CH 2 ) 1-5 OR 4 ,

—O(CH 2 ) 2-4 OR 4 ,

—C(O)R 4 ,

—OR 4 ,

—O(CH 2 ) 2-4 O—(C 3 -C 8 cycloalkyl), wherein cycloalkyl is unsubstituted or substituted with C 1 -C 4 alkyl or C 1 -C 4 alkanol,

—O(CH 2 ) 2-4 NR 4 R 5 ,

R 4 and R 5 are independently C 1 -C 6 alkyl unsubstituted or substituted with —OH or CF 3 .

2. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 1 is —(CH 2 ) 3 OCH 3 , —(CH 2 ) 2 OCH 3 or —O(CH 2 ) 2 OCH 3 .

3. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein Y is O.

4. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein

R 2 is selected from the group consisting of

—(CH 2 ) 3 OR 4 ,

—O—(CH 2 ) 2 OR 4 ,

—C(O)R 4 ,

—OR 4 ,

—O(CH 2 ) 2 O—(C 3 -C 8 cycloalkyl), wherein cycloalkyl is unsubstituted or substituted with C 1 -C 4 alkyl or C 1 -C 4 alkanol,

—O(CH 2 ) 2 NR 4 R 5 , and

5. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein

R 2 is selected from the group consisting of

—(CH 2 ) 3 OCH 3 ,

—O(CH 2 ) 2 OCH 3 ,

—C(O)CH 3 ,

—OCH 2 C(CH 3 ) 2 OH,

—O(CH 2 ) 2 OCH 2 CF 3 ,

—O(CH 2 ) 2 OCH 3 ,

—O(CH 2 ) 2 N(CH 3 ) 2 ,

6. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein

R 4 and R 5 are independently selected from the group consisting of —CH 3 , —CH 2 CF 3 , and —(CH 2 )C(CH 3 ) 2 OH.

7. A compound of claim 1 , or a pharmaceutically acceptable salt thereof, selected from the group consisting of:

(3R,4S)-N-Cyclopropyl-4-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}-N-[3-(2-methoxyethoxy)-5-(3-methoxypropyl)benzyl]piperidine-3-carboxamide,

(3R,4S)-N-Cyclopropyl-4-{6-2-[2,6-dichloro-4-methylphenoxy)ethoxy]pyridin-3-yl}-N-[3-(2-methoxyethoxy)-5-(3-methoxypropyl)benzyl]piperidine-3-carboxamide,

(3R,4S)-N-Cyclopropyl-4-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}-N-[3-[2-(dimethylamino)ethoxy]-5-(3 -methoxypropyl)benzyl]piperidine-3-carboxamide,

(3R,4S)-N-Cyclopropyl-N-[3-[2-(cyclopropyloxy)ethoxy]-5-(3 -methoxypropyl)-benzyl]-4-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}piperidine-3-carboxamide,

(3R,4S)-N-Cyclopropyl-4-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}-N-{3-3-methoxypropyl)-5-[2-(2,2,2-trifluoroethoxy)ethoxy]benzyl}piperidine-3-carboxamide,

(3R,4S)-N-Cyclopropyl-4-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}-N-[3-(2-hydroxy-2-methylpropoxy)-5-(3-methoxypropyl)benzyl]piperidine-3-carboxamide,

(3R,4S)-N-[3-{[1-(Cyanomethyl)cyclopropyl]methoxy}-5 -(3-methoxypropyl)benzyl]-N-cyclopropyl-4-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}piperidine-3-carboxamide,

(3R,4S)-N-Cyclopropyl-4-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}-N-[3-{[(1R,2R)-2-(hydroxymethyl)cyclopropyl]methoxy}-5-(3-methoxypropyl)benzyl]-piperidine-3 -carboxamide,

(3R,4S)-N-[3-Acetyl-5-(3-methoxypropyl)benzyl]-N-cyclopropyl-4-{4-[2-(2,6-di-chloro-4-methylphenoxy)ethoxy]phenyl}piperidine-3-carboxamide,

(3R,4S)-N-Cyclopropyl-4-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}-N-[3-(2-methoxyethoxy)-5-(2-methoxyethyl)benzyl]piperidine-3-carboxamide,

(3R,4S)-N-[3 ,5-Bis(3-methoxypropyl)benzyl]-N-cyclopropyl-4-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}piperidine-3-carboxamide, and

(3R,4S)-N-[3,5-Bis(2-methoxyethoxy)benzyl]-N-cyclopropyl-4- {4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]phenyl}piperidine-3-carboxamide.

8. A pharmaceutical composition comprising an effective amount of a compound according to claim 1 , or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.

9. A method for the treatment of hypertension, comprising the administration to a patient of a pharmaceutically active amount of a compound according to claim 1 .