Phosphines, transition metal complexes containing the same as the ligand, and process for production of optically active carboxylic acids
申请人:Amano Akira
公开号:US20070060772A1
公开(公告)日:2007-03-15
[PROBLEMS] To provide a method by which desired optically active carboxylic acids may be prepared from a carboxylic acid having a carbon-carbon double bond through asymmetric hydrogenation with a catalyst consisting of a transition metal complex containing a water-soluble ligand and which permits easy separation of the used catalyst from the product by liquid-liquid separation alone and enables the recovery of an expensive transition metal and the reuse of the catalyst.
[MEANS FOR SOLVING PROBLEMS] Phosphines represented by the general formula (1):
wherein X
1
is oxygen or methylene; X
2
is methylene, ethylene, trimethylene, 1,2-dimethylethylene, isopropylidene, or difluoromethylene; A is a Group IA alkali metal of the periodic table, hydrogen, or an ammonium ion; and a, b, c and d are each an integer of 0 or 1, with the proviso that the cases wherein the sum of a, b, c, and d is 0 are excepted.
解决问题的方法是提供一种通过使用含有水溶性配体的过渡金属配合物催化剂进行不对称氢化,从而可以从具有碳-碳双键的羧酸制备所需的光学活性羧酸的方法。该方法允许仅通过液-液分离轻松分离已使用的催化剂与产品,并实现昂贵的过渡金属的回收和催化剂的再利用。解决问题的手段是通过一般式(1)表示的膦化合物:
其中X1为氧或亚甲基;X2为亚甲基、乙烯基、三亚甲基、1,2-二甲基乙烯基、异丙基亚甲基或二氟甲基;A为周期表中的IA族碱金属、氢或铵离子;a、b、c和d分别为0或1的整数,但要注意a、b、c和d之和为0的情况除外。