METHOD FOR PRODUCING OPTICALLY ACTIVE 1-BROMO-1-[3,5-BIS(TRIFLUOROMETHYL)PHENYL]ETHANE
申请人:Kowa Company Ltd.
公开号:EP2597079A1
公开(公告)日:2013-05-29
A method for preparing optically active 1-bromo-1-[3,5-bis(trifluoromethyl)phenyl]ethane having a high optical purity, which comprises the step of brominating optically active 1-[3,5-bis(trifluoromethyl)phenyl]ethanol by using, as a brominating agent, (a) a combination of a phosphorus halide and hydrogen bromide, (b) a combination of 1,2-dibromo-1,1,2,2-tetrachloroethane and an organic phosphorous compound represented by the general formula (I): P(R1)(R2)(R3) (in the formula, R1, R2, and R3 independently represent a C6-10 aryl group, a C6-10 aryloxy group, a C1-10 alkyl group, a C1-10 alkoxyl group, a C3-6 cycloalkyl group, or a C3-6 cycloalkoxy group), or (c) a combination ofN-bromosuccinimide and a dialkyl sulfide.
一种制备具有高光学纯度的光学活性 1-溴-1-[3,5-双(三氟甲基)苯基]乙烷的方法,其步骤包括使用以下溴化剂溴化光学活性 1-[3,5-双(三氟甲基)苯基]乙醇、(b) 1,2-二溴-1,1,2,2-四氯乙烷和通式 (I) 所代表的有机磷化合物的组合:P(R1)(R2)(R3)(式中,R1、R2 和 R3 分别代表 C6-10 芳基、C6-10 芳氧基、C1-10 烷基、C1-10 烷氧基、C3-6 环烷基或 C3-6 环烷氧基),或 (c) N-溴琥珀酰亚胺和二烷基硫醚的组合。