Thiophenes as Traps for Benzyne. 3. Diaryl Sulfides and the Role of Dipolar Intermediates
作者:Manfred G. Reinecke、Dario Del Mazza、Marcus Obeng
DOI:10.1021/jo0265176
日期:2003.1.1
mechanisms of formation. The remaining mechanism involves [4+2]-cycloaddition of benzyne to thiophene or to an S-phenylthiophenium ylide 10 to give the dipolar 2:1 benzyne/thiophene adduct 8 followed by ring-opening. Stevens-like rearrangements of 11, formed from 10 by proton transfer, may also explain the origin of arylated thiophenes such as 12 and 3 found in some reactions of benzynes with thiophene.