Palladium‐Catalyzed C−H Alkenylation of Arenes with Alkynes: Stereoselective Synthesis of Vinyl Chlorides via a 1,4‐Chlorine Migration
作者:Zhen Li、Wei‐Liang Duan
DOI:10.1002/anie.201808866
日期:2018.12.3
A directing group‐free, ligand‐promoted palladium‐catalyzed C−H arylation of internal alkynes with simple arenes was developed. Alkenyl chlorides resulting from a 1,4‐chlorine migration or trisubstituted alkenes were produced in moderate to good yields depending on the type of alkyne.
Rh(CO)2(acac) was found to be an efficient and simple catalyst in hydroarylation of diaryl acetylenes with boronic acids in the absence of phosphine ligand. Thus, triaryl-substituted olefins were prepared in good to excellent yields. No 1,4-rhodium shift was observed in the catalytic cycle. (c) 2008 Published by Elsevier Ltd.