Both isomers 5 and 8 of 3,3-diarylacrylonitrile constitution are obtained in highly diastereoselective Pd-catalyzed Heck reactions under Jeffery conditions between (E)-cinnamonitriles and aryl iodides.
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 copperhydride 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
The coupling reaction of 3-aryl (or heteroaryl) acrylonitriles with several aryl and heteroaryl iodides (Heck reaction) under Jeffery’s conditions has been studied as a concept to synthesize, in a stereospecific manner, trisubstituted olefins.