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.
Tridentate SCS Palladium(II) Complexes: New, Highly Stable, Recyclable Catalysts for the Heck Reaction
作者:David E. Bergbreiter、Philip L. Osburn、Yun-Shan Liu
DOI:10.1021/ja991099g
日期:1999.10.1
A new pincer-type SCS ligand containing Pd(II) is a simple, robust catalyst for Heck chemistry using a variety of alkene acceptors and aryl iodides. It is less active with aryl bromides. While certain palladium(II) species insert slowly into the aryl C−H bond of an unsubstituted version of this ligand, the introduction of activating groups into the 5 position of the aromatic ring readily allows quantitative
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.