申请人:TEIJIN LIMITED
公开号:EP1298130A1
公开(公告)日:2003-04-02
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.
本发明是一种生产 3-羟甲基-苯并[b]噻吩衍生物而不会同时形成异构体的方法,该方法包括选择性地环化具有以下反应方案中所示 X 的亚砜:
其中 R1 至 R3 相同或独立地为氢原子、1 至 4 个碳原子的烷基、三卤甲基、1 至 4 个碳原子的烷氧基、1 至 4 个碳原子的烷硫基或三卤甲氧基;R4 是酰基;X 是卤素原子、羟基、氨基、巯基、1 至 9 个碳原子的烷硫基、1 至 9 个碳原子的酰氧基、1 至 9 个碳原子的酰氨基或三卤甲氧基。