| abstract |
The present invention provides compounds represented by general formula (I): n n nor pharmaceutical acceptable salts thereof, wherein R 1 and R 2 are each hydrogen or lower alkyl; R 3 , R 4 , R 5 and R 6 are each hydrogen, halogen, lower alkyl or lower alkoxy; R 7 and R 8 are each hydrogen, halogen, lower alkyl, halo-lower alkyl, lower alkoxy, cycloalkyl, aryl, heteroaryl, cyano, a hydroxyl group, lower acyl, carboxy or the like; R 9 is —C(O)—R 10 , -A 1 -C(O)—R 10 , —O-A 2 -C(O)—R 10 or a tetrazol-5-yl group, which exhibit potent and selective β3-adrenoceptor stimulating activities. The present invention also provides pharmaceutical compositions containing said compound, and uses thereof. |