Novel compounds

Abstract

Compounds of formula (I) wherein R 1 is 2-indanyl, R 2 is 1-methylpropyl, R 3 is a group selected from 2,6-dimethyl-3-pyridyl or 4,6-dimethyl-3-pyridyl, R 4 represents methyl and R 5 represents hydrogen or methyl or, R 4 and R 5 together with the nitrogen atom to which they are attached represent morpholino and pharmaceutically acceptable derivatives thereof are described, as are processes for their preparation, pharmaceutical compositions containing them and their use in medicine, particularly their use as oxytocin antagonists.

1 . A compound selected from the group consisting of: 
     (2R)-2-{(3R,6R)-3-(2,3-dihydro-1H-inden-2-yl)-6-[(1S)-1-methylpropyl]-2,5-dioxo-1-piperazinyl}-2-(2,6-dimethyl-3-pyridinyl)-N-methylethanamide; 
     (2R)-2-{(3R,6R)-3-(2,3-Dihydro-1H-inden-2-yl)-6-[(1S)-1-methylpropyl]-2,5-dioxo-1-piperazinyl}-2-(4,6-dimethyl-3-pyridinyl)-N,N-dimethylethanamide; 
     (2R)-2-{(3R,6R)-3-(2,3-Dihydro-1H-inden-2-yl)-6-[(1S)-1-methylpropyl]-2,5-dioxo-1-piperazinyl}-2-(4,6-dimethyl-3-pyridinyl)-N-methylethanamide; 
     or a pharmaceutically acceptable salt thereof. 
   
   
       2 . A compound according to  claim 1 , which is (2R)-2-{(3R,6R)-3-(2,3-dihydro-1H-inden-2-yl)-6-[(1S)-1-methylpropyl]-2,5-dioxo-1-piperazinyl}-2-(2,6-dimethyl-3-pyridinyl)-N-methylethanamide; or a pharmaceutically acceptable salt thereof. 
   
   
       3 . A compound according to  claim 1 , which is (2R)-2-{(3R,6R)-3-(2,3-Dihydro-1H-inden-2-yl)-6-[(1S)-1-methylpropyl]-2,5-dioxo-1-piperazinyl}-2-(4,6-dimethyl-3-pyridinyl)-N,N-dimethylethanamide; or a pharmaceutically acceptable salt thereof. 
   
   
       4 . A compound according to  claim 1 , which is (2R)-2-{(3R,6R)-3-(2,3-Dihydro-1H-inden-2-yl)-6-[(1S)-1-methylpropyl]-2,5-dioxo-1-piperazinyl}-2-(4,6-dimethyl-3-pyridinyl)-N-methylethanamide; or a pharmaceutically acceptable salt thereof. 
   
   
       5 . A method of treating or preventing diseases or conditions mediated through the action of oxytocin which comprises administering to a human in need thereof of an effective amount of at least one chemical entity according to  claim 1 . 
   
   
       6 . A method according to claim  13  wherein the disease or condition is selected from: pre-mature ejaculation, pre-term labour, dysmenorrhea, endometriosis and benign prostatic hyperplasia.