Asymmetric Synthesis of 1,1-Diarylalkyl Units by a Copper Hydride Catalyzed Reduction: Differentiation Between Two Similar Aryl Substituents
作者:Kihyun Yoo、Hyohyun Kim、Jaesook Yun
DOI:10.1002/chem.200901262
日期:2009.10.26
An efficient method for the preparation of enantiomerically enriched 1,1‐diarylalkyl units has been developed. The use of copper hydride complexed by the (R)‐1‐[(S)‐2‐diphenylphosphino)ferrocenyl]ethyldicyclohexylphosphine (Josiphos) ligand effects a highly enantioselective conjugate reduction of β,β‐diaryl‐substituted α,β‐unsaturated nitriles with aryl groups of similar steric demand and no secondary
已开发出一种有效的方法来制备对映体富集的1,1-二芳基烷基单元。氢化铜与(R)-1 [[(S)-2-二苯基膦基)二茂铁基]乙基二环己基膦(Josiphos)配位体的络合可实现β,β-二芳基取代的α,β-不饱和腈的高度对映体选择性共轭还原具有类似空间需求的芳基,并且没有二级配位点。减少了在芳基上具有间位和对位取代基的一系列底物,对映选择性很好(至97%对映体过量(ee)),并且该方法学被用于indatraline的正式合成。