abstract |
The instant invention provides intermediates and processes for the preparation of compounds of formula (IV), wherein n is 0, 1, or 2; R is hydrogen or C1-C4 alkyl; X1 is hydrogen, cyano, 4-hydroxybenzoyl, 4-halobenzoyl, or 4-(C¿1?-C4 alkoxy)benzoyl; Y is NR?4R5¿, 4-hydroxyphenyl, or 4-(C¿1?-C4 alkoxy)phenyl; and R?4 and R5¿ are independently hydrogen or C¿1?-C4 alkyl. |