申请人:Puentener Kurt
公开号:US20080027249A1
公开(公告)日:2008-01-31
The invention relates to the preparation of enantiomerically pure (S)-1,1,1-trifluoro-2-propanol by asymmetric hydrogenation of 1,1,1-trifluoroacetone which process comprises hydrogenating 1,1,1-trifluoroacetone in the presence of a ruthenium phosphine complex catalyst represented by formula
Ru(E)(E)(L)(A)
wherein E, E′ are both chloro or E is hydrogen and E′ is BH
4
;
L is a chiral diphosphine ligand; and
A is an optionally chiral diamine
wherein hydrogenation occurs in the presence of a weak base, with or without an additive, when E and E′ are both chloro or
b) in the absence of a base and an additive when E and E′ are hydrogen and BH
4
.
该发明涉及通过不对称氢化1,1,1-三氟乙酮来制备对映纯的(S)-1,1,1-三氟-2-丙醇的方法,该过程包括在存在以Ru(E)(E)(L)(A)为表示的钌膦配合物催化剂下氢化1,1,1-三氟乙酮,其中E,E′均为氯或E为氢,E′为BH4;L为手性双膦配体;A为可选择手性二胺,在E和E′均为氯或b)时,在弱碱的存在下进行氢化,有无添加剂均可,当E和E′均为氢和BH4时,在无碱和添加剂的情况下进行氢化。