METHOD FOR PREPARING OPTICALLY ACTIVE 1-BROMO-1-[3,5-BIS(TRIFLUOROMETHYL)PHENYL]ETHANE
申请人:Kusakabe Taichi
公开号:US20130190540A1
公开(公告)日:2013-07-25
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(R
1
)(R
2
)(R
3
) (in the formula, R
1
, R
2
, and R
3
independently represent a C
6-10
aryl group, a C
6-10
aryloxy group, a C
1-10
alkyl group, a C
1-10
alkoxyl group, a C
3-6
cycloalkyl group, or a C
3-6
cycloalkoxy group), or (c) a combination of N-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,包括以下步骤:使用磷卤和氢溴酸的组合物、1,2-二溴-1,1,2,2-四氯乙烷和由一般式(I)表示的有机磷化合物(其中,R1、R2和R3独立地表示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N-溴代琥珀酰亚胺和二烷基硫化物作为溴化试剂,溴代光学活性1-[3,5-双(三氟甲基)苯基]乙醇。