Patent number: 5948811
Abstract: A compound of formula (I) or pharmaceutically acceptable salt thereof: ##STR1## wherein either Y is N and R.sub.2 is hydrogen, or Y is C--R.sub.1 ; where either one of R.sub.1 and R.sub.2 is hydrogen and the other is selected from the class of hydrogen, C.sub.3-8 cycloalkyl, C.sub.1-6 alkyl optionally interrupted by oxygen or substituted by hydroxy, C.sub.1-6 alkoxy or substituted arminocarbonyl, C.sub.1-6 alkylcarbonyl, C.sub.1-6 alkoxycarbonyl, C.sub.1-6 alkylcarbonyloxy, C.sub.1-6 alkoxy, nitro, cyano, halo, trifluoromethyl, CF.sub.3 S, or a group CF.sub.3 --A--, or a group CF.sub.2 H--A'--, trifluoromethoxy, C.sub.1-6 alkylsulphinyl, perfluoro C.sub.2-6 alkylsulphonyl, C.sub.1-6 alkylsulphonyl, C.sub.1-6 alkoxysulphinyl, C.sub.1-6 alkoxysulphonyl, aryl, heteroaryl, arylcarbonyl, heteroarylcarbonyl, phosphono, arylcarbonyloxy, heteroarylcarbonyloxy, arylsulphinyl, heteroarylsulphinyl, arylsulphonyl, heteroarylsulphonyl, C.sub.1-6 alkylcarbonylamino, C.sub.1-6 alkoxycarbonylamino, C.sub.
Type:
Grant
Filed:
May 8, 1997
Date of Patent:
September 7, 1999
Assignee:
SmithKline Beegham p.l.c.
Inventors:
Wai Ngor Chan, John Morris Evans, Geoffrey Stemp, Neil Upton, Robert Nicholas Willette
