The present invention is a method of producing a 3-hydroxymethyl-benzo[b]thiophene derivative without the possible concomitant formation of isomers, which comprises selectively cyclizing a sulfoxide having X shown in the reaction scheme below:
wherein R1 to R3 are, same or independently, a hydrogen atom, an alkyl group having 1 to 4 carbons, a trihalomethyl group, an alkoxy group having 1 to 4 carbons, an alkylthio group having 1 to 4 carbons, or a trihalomethoxy group; R4 is an acyl group; X is a halogen atom, a hydroxy group, an amino group, a mercapto group, an alkylthio group having 1 to 9 carbons, an acyloxy group having 1 to 9 carbons, an acylamino group having 1 to 9 carbons, or a trihalomethoxy group.
本发明涉及一种制备3-羟甲基苯并[b]
噻吩衍
生物的方法,该方法不会伴随着异构体的形成,其包括选择性地环化具有下面反应方程中所示的X的亚砜:其中,R1至R3分别是氢原子、具有1到4个碳的烷基、三卤甲基、具有1到4个碳的烷氧基、具有1到4个碳的烷
硫基或三卤甲氧基,且可以相同或独立;R4是酰基;X是卤原子、羟基、
氨基、巯基、具有1到9个碳的烷
硫基、具有1到9个碳的酰氧基、具有1到9个碳的酰胺基或三卤甲氧基。