| abstract |
New bronchospasmolytically active compounds exhibiting long duration of action and reduced undesired side effects, of the structural formulan and therapeutically acceptable salts thereof, in which formula R, R 1 and R 2 are as follows: R is selected from the group consisting of -C(CH 3 ) 3 ,n R 1 is selected from the group consisting of H and R 2 ; R 2 is selected from the group consisting of (a)n (b)n and (c)n n n in which formulas R 3 is selected from the group consisting ofn (a) H;n wherein R 5 is a straight or branched alkyl group containing 1-4 carbon atoms; and (c)n R 4 is selected from the group consisting of (a) H (b) an alkyl group containing 1-3 carbon atoms, process for the preparation thereof, chemical intermediates at their preparation, pharmaceutical compositions containing them and their medicinal use. |