| abstract |
Compounds of the formula <IMAGE> I inhibit the activity of endothelin. The symbols are defined as follows: R1, R2, R3 and R4 are each directly bonded to a ring carbon and are each independently (a) hydrogen; (b) alkyl, alkenyl, alkynyl, alkoxy, cycloalkyl, cycloalkylalkyl, cycloalkenyl, cycloalkenylalkyl, aryl, aryloxy, aralkyl or aralkoxy, any of which may be substituted with Z1, Z2 and Z3; (c) halo; (d) hydroxyl; (e) cyano; (f) nitro; (g) -C(O)H or -C(O)R5; (h) -CO2H or -CO2R5; (i) -Z4-NR6R7; (j) -Z4-N(R10)-Z5-NR8R9; or (k) R3 and R4 together may also be alkylene or alkenylene, either of which may be substituted with Z1, Z2 and Z3, completing a 4- to 8-membered saturated, unsaturated or aromatic ring together with the carbon atoms to which they are attached; and the remaining symbols are as defined in the specification. |