作者:Péter Pongrácz、László Kollár
DOI:10.1002/jhet.2726
日期:2017.3
3‐dioxolan‐2‐one was used as racemic substrate in asymmetric hydroformylation. The catalysts were formed in situ from “pre‐formed” PtCl2(diphosphine) and tin(II) chloride. (2S,4S)‐2,4‐Bis(diphenylphosphinopentane ((S,S)‐BDPP)), (S,S)‐2,3‐O‐izopropylidine‐2,3‐dihydroxy‐1,4‐bis(diphenylphosphino)butane ((S,S)‐DIOP)), and (R)‐2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl ((R)‐BINAP)) were used as optically active diphosphine
在不对称加氢甲酰化反应中,使用手性环状碳酸酯4-乙烯基-1,3-二氧戊环-2-酮作为外消旋底物。催化剂是由“预制的” PtCl 2(二膦)和氯化锡(II)原位形成的。(2S,4S)-2,4-双(二苯基膦基戊烷((S,S)-BDPP)),(S,S)-2,3- O-偶氮丙啶-2-,3-二羟基-1,4-双二苯基膦基)丁烷((S,S)-DIOP))和(R)-2,2'-双(二苯基膦基)-1,1'-联萘基((R)-BINAP))用作旋光性二膦配体。含铂的催化体系提供了惊人的高活性。高达97%的加氢甲酰化选择性伴随着对基于二氧戊环的线性醛的完美区域选择性。确定反应混合物中所有组分的对映体组成,并在整个反应过程中进行跟踪。以光学活性形式回收未反应的4-乙烯基-1,3-二氧戊环-2-酮。使用底物和产物的对映体组成使动力学拆分合理化。