Pharmaceutical compositions having .beta.-adrenoceptor antagonist
申请人:Smith Kline & French Laboratories Limited
公开号:US04678786A1
公开(公告)日:1987-07-07
This invention relates to (isopropyl and tertiary butyl-amino-2-hydroxypropoxy)phenyl-3[2H]-pyridazinones which have .beta.-adrenoceptor antagonist activity.
This invention relates to (isopropyl and tertiary butyl-amino-2-hydroxypropoxy)phenyl-3[2H]-pyridazinones which have .beta.-adrenoceptor antagonist activity.
Compounds of the formula (I):
and pharmaceutically acceptable salts thereof, wherein
R1 is isopropyl or tertiary-butyl;
R2 is hydrogen, C1-4alkyl, C1-4alkoxy, hydroxy or amino; and
R3 is hydrogen or methyl; are described for use as β-adrenoceptor antagonists. Pharmaceutical compositions containing them are disclosed as are processes for their preparation and intermediates therefor.