Mono- and β,β-Double-Heck Reactions of α,β-Unsaturated Carbonyl Compounds in Aqueous Media
作者:Luis Botella、Carmen Nájera
DOI:10.1021/jo0502551
日期:2005.5.1
and nitrile. β,β-Diarylation of unsubstituted α,β-unsaturated carbonyl compounds can be controlled by using higher loading of the palladacycle and can be performed in refluxing water for aryl iodides, whereas DMA must be used for aryl bromides. Microwave irradiation can be used in the monoarylation of tert-butyl acrylate with aryl iodides in water or the coupling between ethyl cinnamate and aryl bromides
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