Easily Accessible and Highly Tunable Bisphosphine Ligands for Asymmetric Hydroformylation of Terminal and Internal Alkenes
作者:Kun Xu、Xin Zheng、Zhiyong Wang、Xumu Zhang
DOI:10.1002/chem.201304684
日期:2014.4.7
An efficient methodology for synthesizing a small library of easily tunable and sterically bulky ligands for asymmetric hydroformylation (AHF) has been reported. Five groups of alkene substrates have been tested with excellent conversions, moderate‐to‐excellent regio‐ and enantioselectivities. Among the best result of the reported literature, application of ligand 1 c in the highly selective AHF of
已经报道了一种有效的方法,该方法可合成用于不对称加氢甲酰化(AHF)的易于调节且空间庞大的配体的小文库。已测试了五组烯烃底物,具有优异的转化率,中等至出色的区域选择性和对映选择性。在所报道文献的最佳结果中,将配体1c应用于具有挑战性的底物2,5-二氢呋喃的高选择性AHF中,产生了几乎一种异构体,转化率高达99%,对映体过量(ee)高达92% 。使用相同的配体可实现二氢吡咯底物的高度对映选择性AHF,ee高达95% ,β-异构体/α-异构体比率高达> 1:50。