5-Exo cyclizations of primary and secondary radicals with acylsilanes successfully give cyclopentyl silyl ethers. The corresponding 6-exo cyclizations are sensitive to changes of the size of silyl groups. Secondary radicals undergo 6-exo cyclizations with acylsilanes more slowly. Reaction of aryl radical with acylsilane proceeds well for 5-exo cyclization but not for 6-exo cyclization. Vinyl radicals give best results in 5-exo cyclizations with acylsilanes but give low yields (similar to 30%) in 6-exo cyclizations. Intramolecular cyclizations of vinyl radicals with acylsilanes give enol silyl ethers regiospecifically.
Paul, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1931, vol. 193, p. 599
作者:Paul
DOI:——
日期:——
SHI, L.;NARULA, C. K.;MAK, K. T.;KAO, L.;XU, Y.;HECK, R. F., J. ORG. CHEM., 1983, 48, N 22, 3894-3900
作者:SHI, L.、NARULA, C. K.、MAK, K. T.、KAO, L.、XU, Y.、HECK, R. F.