Roussel Uclaf

Rogert Deraedt

Francoise Delevallee

Jean-Paul Vevert

Novel .omega.-mercaptopropanamides and their homologs of the formula ##STR1## wherein R.sub.1 is selected from the group consisting of hydrogen and ##STR2## R.sub.1 ' is selected from the group consisting of alkyl of 1 to 5 carbon atoms and aryl optionally substituted with at least one member of the group consisting of --OH, alkyl and alkoxy of 1 to 5 carbon atoms, --NO.sub.2 and halogen, n is an integer from 1 to 5, R.sub.2 is selected from the group consisting of hydrogen alkyl of 1 to 5 carbon atoms and aryl and aralkyl of 6 to 15 carbon atoms optionally substituted with at least one member of the group consisting of alkyl and alkoxy of 1 to 5 carbon atoms, --OH, halogen and --CF.sub.3, R.sub.3 is selected from the group consisting of a) hydrogen, b) phenyl optionally substituted with at least one member of the group consisting of alkyl and alkoxy of 1 to 5 carbon atoms, --OH, --NO.sub.2, halogen, --CF.sub.3, carboxymethyl, alkoxycarbonylmethyl with 1 to 5 alkoxy carbon atoms, aralkoxy of 7 to 15 carbon atoms and ##STR3## and c) a heterocycle selected from the group consisting of thiazolyl, 4,5-dihydro-thiazolyl, pyridinyl, oxazolyl, isoxazolyl, imidazolyl, pyrimidyl, tetrazolyl, benzimidazolyl, benzothiazolyl and benzoxazolyl, all optionally substituted with alkyl of 1 to 5 carbon atoms, X and X' are individually selected from the group consisting of hydrogen and alkyl of 1 to 5 carbon atoms and their salts with non-taxic, pharmaceutically acceptable acids and bases with the proviso that when R.sub.2 is hydrogen and n is 1, R.sub.3 is not phenyl optionally substituted with at least one member of the group consisting of halogen and alkyl and alkoxy of 1 to 5 carbon atoms and when R.sub.2 is methyl and n is 1, R.sub.3 is not phenyl substituted with carboxymethyl having very good analgesic activity and enkephalinase inhibiting activity.

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Rogert Deraedt