| abstract |
Disclosed are novel compounds of the formula <IMAGE> wherein: R is <IMAGE> where Ph is phenyl, or <IMAGE> X is -NR5R6 or -OR7; R1 and R2 are independently hydrogen, methyl, ethyl, cyclohexyl, <IMAGE> butyl, or heptyl; R4 is o-phenylene or p-phenylene and R4 can be alkyl- halo- or alkoxy- substituted; R3 is hydrogen; R5, R6, and R7 are independently hydrogen, methyl, ethyl, tert-butyl, isobutyl, butyl, alkoxy, acyl, acylamino, aryl, amino, cyclohexyl, aminoalkyl and substituted or unsubstituted phenylamino; Y is sulfur and oxygen atom; and n is zero or 1; provided n=1 when Y is sulfur. |