A Ferrocene‐Based Phosphane/Borane Frustrated Lewis Pair for Asymmetric Imine Reduction
作者:Ke‐Yin Ye、Xiaowu Wang、Constantin G. Daniliuc、Gerald Kehr、Gerhard Erker
DOI:10.1002/ejic.201600834
日期:2017.1.10
The α-phosphanylferrocenecarbaldehyde (pS)-1 was converted into the β-styryl derivative (pS)-4 by Wittig–Horner olefination. Subsequent hydroboration with Piers' borane [HB(C6F5)2] followed by H2 splitting and crystallization gave the phosphonium/hydridoborate product (pS,R)-5, which was used as a frustrated Lewis pair catalyst for the asymmetric hydrogenation of a series of imines (up to 69 % ee)