申请人:——
公开号:US20030191325A1
公开(公告)日:2003-10-09
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:
1
wherein R
1
to R
3
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; R
4
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.
本发明是一种制备3-羟甲基苯并[b]噻吩衍生物的方法,不会伴随同构体的形成,其包括选择性地环化具有下列反应方程式中所示X的亚砜:1其中R1至R3相同或独立地是氢原子、具有1至4个碳的烷基、三卤甲基、具有1至4个碳的烷氧基、具有1至4个碳的烷硫基或三卤甲氧基;R4是酰基;X是卤原子、羟基、氨基、巯基、具有1至9个碳的烷硫基、具有1至9个碳的酰氧基、具有1至9个碳的酰胺基或三卤甲氧基。