Synthesis of 1-Aryl-2-Vinyl Cyclopropanes by Intramolecular Carbolithiation
摘要:
Benzylselenides bearing a gamma-alkenyl-epsilon-sulfonyloxy side chain react with butyllithiums to produce, via the corresponding benzyllithiums, 1-aryl-2-vinyl cyclopropanes. (C) 1997 Published by Elsevier Science Ltd.
A practical cyclopropanation method using direct generation of organozinc carbenoids from carbonyl compounds
作者:William B. Motherwell、Lee R. Roberts
DOI:10.1039/c39920001582
日期:——
A variety of readily available aryl and α,β-unsaturated carbonyl compounds, on treatment with zinc and 1,2-bis(chlorodimethylsily)ethane, afford organozinc carbenoids which may be trapped with alkenes to give cyclopropanes.
Catalytic cyclopropanation reactions with α-silyl-, germanyl- and stannyl carbenes generated from cyclopropenes
作者:Darío Coto、Iratxe Barbolla、Rubén Vicente
DOI:10.1039/d2cc03338k
日期:——
as precursors of α-silyl vinyl carbenes and trapped with alkenes. Cyclopropylsilanes were obtained in good yields with ample scope and complete regio- and diastereoselectivity. Stereoretentive protodesilylations enabled access to cis-1,2-disubstituted cyclopropanes. Cyclopropylstannanes and -germanes can also be prepared from the corresponding cyclopropenes.