Tetrahydroquinoline derivatives and a process for preparing the same

1. A method for treatment of arteriosclerosis dyslipidemia, or coronary artery disease, which comprises

administering an effective amount of a compound of the formula (I):

wherein R 1 is an alkoxycarbonyl group or an alkoxycarbonyl group substituted by 1 to 5 substituents selected independently from a carboxyl group, an alkoxycarbonyl group, a halogen atom, a hydroxy group and a cycloalkyl group;

R 2 is an alkyl group;

R 3 is a hydrogen atom;

R 4 is an alkylene group;

R 5 is a group of the formula:

in which Ring A is a pyrimidinyl group or a pyridyl group and R 11 is an alkoxy group substituted by a carboxyl group, a cyano group, a hydroxy group, an alkoxy group, an alkylthio group or an alkylsulfonyl group; a mono- or di-alkylamino group; or a mono- or di-alkylamino group substituted by an alkoxy group;

R 10 is a phenyl group substituted by 1 to 3 substituents selected from a cyano group, an alkyl group, an alkyl group substituted by one or more halogen atom, and an alkoxy group;

R 6 and R 9 each are a hydrogen atom;

R 7 is an alkyl group, an alkyl group substituted by one or more halogen atom, an alkoxy group, or a mono- or di-alkylamino group; and

R 8 is a hydrogen atom,

or a pharmaceutically acceptable salt thereof.

2. The method according to claim 1 , wherein R 1 is an ethoxycarbonyl group, a hydroxyethoxycarbonyl group, a 2-fluoroethoxycarbonyl group, a 2,2-difluoroethoxycarbonyl group or a 2,2,2-trifluoroethoxycarbonyl group; R 2 is an ethyl group;

R 10 is a phenyl group substituted by 1 to 2 substituents selected from a cyano group, a trifluoromethyl group and a methoxy group; and R 7 is a trifluoromethyl group or a methoxy group.

3. The method according to claim 1 , wherein R 1 is a carboxy(C 2-10 alkoxy)carbonyl group or an alkoxycarbonyl(C 2-10 alkoxy)carbonyl group; R 2 is an ethyl group; R 10 is a phenyl group substituted by 1 to 2 substituents selected from a cyano group, a trifluoromethyl group and a methoxy group; and R 7 is a trifluoromethyl group or a methoxy group.

4. The method according to claim 1 , wherein the compound of the formula (I) is selected from the group consisting of:

(2R,4S)-4-[[3,5-Bis(trifluoromethyl)benzyl]-(5-{[methyl-(2-methoxyethyl)]-amino }pyrimidin-2-yl)]amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-[5-(2-methoxyethoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-carboxypropoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(4-carboxybutoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(5-carboxypentyloxy)pyrimidin-2-yl ]}amino-2 -ethyl-6-trifluoromethyl-3 ,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-[5-(2-carboxyethoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester;

(2R,4S)-4- {(3-Cyano-5-trifluoromethylbenzyl)-[5-(4-carboxybutoxy)pyrimidin-2-yl ]amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-carboxypropoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-methoxy-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-carboxypropoxy)pyrimidin-2-yl ]}amino-2 -ethyl-6-dimethylamino-3 ,4-dihydro-2H-quinoline-1 -carboxylic acid ethyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethypbenzyl]-[5-(3-carboxypropoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2,2,2-trifluoroethyl ester; and

(2R,4S)-4- {(3-Cyano-5-trifluoromethylbenzyl)-[5-(3-carboxypropoxy)pyrimidin-2-yl ] } amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2,2,2-trifluoroethyl ester,

or a pharmaceutically acceptable salt thereof.

5. The method according to claim 1 , wherein the compound of the formula (I) is selected from the group consisting of:

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(2-hydroxyethoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 3-carboxypropyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(2-hydroxyethoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 4-carboxybutyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethypbenzyl]-[5-(2-hydroxyethoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-[5-(2-methoxyethoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3 ,4-dihydro-2H-quinoline- 1 -carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(2-methoxyethoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 5-carboxypentyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-cyanopropoxy)pyrimidin-2-yl ]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 3-carboxypropyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-cyanopropoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 4-carboxybutyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-cyanopropoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1 -carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-cyanopropoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3 ,4-dihydro-2H-quinoline-1 -carboxylic acid 5-carboxypentyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-(5-dimethylaminopyrimidin-2-yl)}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 3-carboxypropyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-(5-dimethylaminopyrimidin-2-yl)}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 4-carboxybutyl ester;

(2R,4S)-4-{[3,5 -Bis(trifluoromethyl)benzyl]-(5 -dimethyl aminopyrimidin-2-yl)}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2 H-quinoline- 1 -carboxylic acid 2-carboxy-2 -methylpropyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-(5-dimethylaminopyrimidin-2-yl)}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 5-carboxypentyl ester;

(2R,4S)-4-{(3-Cyano-5-trifluoromethylbenzyl)[5-(2-methoxyethoxy)pyrimidin-2-yl]}amino-2 -ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline- 1 -carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-{(3-Cyano-5-trifluoromethylbenzyl)[5-(2-methoxyethoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 3-carboxypropyl ester;

(2R,4S)-4-{(3-Cyano-5-trifluoromethylbenzyl)[5-(2-methoxyethoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1 -carboxylic acid 4-carboxybutyl ester;

(2R,4S)-4-{(3-Cyano-5-trifluoromethylbenzyl)[5-(2-methoxyethoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-[5-(2-hydroxyethoxy)pyridin-2-yl[}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(2-methoxyethoxy)pyridin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethypbenzyl]-[5-(2-methoxyethoxy)pyridin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 3-carboxypropyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(2-methoxyethoxy)pyridin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 4-carboxybutyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethypbenzyl]-[5-(2-methoxyethoxy)pyridin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-cyanopropoxy)pyridin-2-yl]}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-(5-dimethylaminopyridin-2-yl)}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline-1 -carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-(5-dimethylaminopyridin-2-yl)}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 3 -carboxypropyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-(5-dimethyl aminopyridin-2-yl)}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 4-carboxybutyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-(5-dimethyl aminopyridin-2-yl)}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4- {(3-Cyano-5-trifluoromethylbenzyl)-[5-(2-methoxyethoxy)pyridin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxyethyl ester; and

(2R,4S)-4-{(3-Cyano-5-trifluoromethylbenzyl)-[5-(2-methoxyethoxy)pyrimidin-2-yl]}amino-2-ethyl-6,7-ethylenedioxy-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxyethyl ester,

or a pharmaceutically acceptable salt thereof.

6. The method according to claim 1 , wherein the compound of the formula (I) is selected from the group consisting of:

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-hydroxypropoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-[5-(2,3-dihydroxypropoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-hydroxypropoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(2,3-dihydroxypropoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1 -carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-{(3-Cyano-5-trifluoromethylbenzyl)-[5-hydroxyethoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4-{(3-Cyano-5-trifluoromethylbenzyl)-[5-(2-methoxyethoxy)pyrimidin-2-yl ]{amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4-{[5-(3-Cyanopropoxy)pyrimidin-2-yl]-(3 -Cyano-5-trifluoromethylbenzyl) }amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline- 1 -carboxylic acid 2-carboxy-2-methylpropyl ester;

(2R,4S)-4-{(3-Cyano-5-trifluoromethylbenzyl)-[5-(2-hydroxyethoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-{(3-Cyano-5-trifluoromethylbenzyl)-[5-(2-methoxyethoxy)pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline- 1 -carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-{[5 -(3-Cyanopropoxy)pyrimidin-2-yl]-(3 -Cyano-5 -trifluoromethylbenzyl) }amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline- 1 -carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-[(3-Cyano-5-trifluoromethylbenzyl)-(5 -dimethylaminopyrimidin-2-yl)]amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxyethyl ester;

(2R,4 S)-4-([3,5-Bis(trifluoromethyl)benzyl]- {5 -[(ethyl-methyl)amino]pyrimidin-2-yl })amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline- 1 -carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4- {[3,5-Bis(trifluoromethyl)benzyl]-(5-diethyl aminopyrimidin-2-yl) }amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid 2-carboxyethyl ester;

(2R,4S)-4-([3,5-Bis(trifluoromethyl)benzyl]- {5-[(ethyl-methyl)amino]pyrimidin-2-yl })amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline- 1 -carboxylic acid 2-carboxy-2-methylpropyl ester; and

(2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-(5-di ethylaminopyrimidin-2-yl)}amino-2-ethyl -6-trifluoromethyl-3,4-dihydro-2H-quinoline- 1 -carboxylic acid 2-carboxy-2-methylpropyl ester,

or a pharmaceutically acceptable salt thereof.

7. The method according to claim 2 , wherein R 1 is an ethoxycarbonyl group or a hydroxyethoxycarbonyl group; R 2 is an ethyl group; R 10 is a phenyl group substituted by 1 to 2 substituents selected from cyano group, trifluoromethyl group and methoxy group; R 7 is a trifluoromethyl group or a methoxy group.

8. The method according to claim 1 , wherein the compound of the formula (I) is (2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(4-carboxybutoxy) pyrimidin-2-yl]}amino-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1 -carboxylic acid ethyl ester, or a pharmaceutically acceptable salt thereof.

9. The method according to claim 1 , wherein the compound of the formula (I) is (2R,4S)-4-{[3,5-Bis(trifluoromethyl)benzyl]-[5-(3-carboxypropoxy)-pyrimidin -2-yl]}amino -2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester, or a pharmaceutically acceptable salt thereof.

10. The method according to claim 1 , wherein the arteriosclerosis is atherosclerosis.

11. The method according to claim 1 , wherein the dyslipidemia is selected from the group consisting of hyperbetalipoproteinemia, hypoalphalipoproteinemia, hypercholesterolemia, familial-hypercholesterolemia, and hypertriglyceridemia.