OXA-SPIRODIPHOSPHINE LIGAND AND METHOD FOR ASYMMETRIC HYDROGENATION OF alpha, beta-UNSATURATED CARBOXYLIC ACIDS
申请人:SHENZHEN CATALYS TECHNOLOGY CO., LTD.
公开号:US20210340168A1
公开(公告)日:2021-11-04
The present invention provides an oxa-spirodiphosphine ligand having a structure of general Formula (I) below:
wherein in general Formula (I), R
1
, R
2
, R
3
and R
4
are the same, and are alkyl, alkoxy, aryl, aryloxy, or hydrogen, in which R
1
, R
2
, R
3
and R
4
may or may not form a ring, any two of them may form a ring, or a polycyclic ring may be formed between two pairs of them; R
5
and R
6
is alkyl, aryl, or hydrogen; and R
7
and R
8
is alkyl, benzyl, or aryl. The present invention also provides a method for asymmetric hydrogenation of α,β-unsaturated carboxylic acids. A complex of the oxa-spirodiphosphine ligand with ruthenium shows excellent activity and enantioselectivity in the asymmetric hydrogenation of various α,β-unsaturated carboxylic acids, with which a chiral carboxylic acid product can be obtained with an enantioselectivity up to 99%.
本发明提供了一种具有下面一般式(I)结构的氧杂螺环二膦配体:
在一般式(I)中,R1、R2、R3和R4相同,可以是烷基、烷氧基、芳基、芳氧基或氢,其中R1、R2、R3和R4可能形成环,也可能不形成环,其中任意两个可以形成环,或者两对它们之间可能形成多环环;R5和R6是烷基、芳基或氢;R7和R8是烷基、苄基或芳基。本发明还提供了一种不对称氢化α,β-不饱和羧酸的方法。氧杂螺环二膦配体与钌形成的配合物在各种α,β-不饱和羧酸的不对称氢化中表现出优异的活性和对映选择性,可获得对映选择性高达99%的手性羧酸产品。