Preparation of 2-vinylcyclobutanones and their conversion to cyclopentenones
作者:David A. Jackson、Max Rey、André S. Dreiding
DOI:10.1016/s0040-4039(00)94015-2
日期:1983.1
Methyl- and ethyl-vinylketene were added to several simple olefins to afford alkylated 2-vinylcyclobutanones , which in turn rearranged to cyclopentenones (via dienones ,) or (via 1,2-acyl migration) under acid catalysis. Evidence is presented for a cyclopropyl-carbinyl intermediate .
JACKSON, D. A.;REY, M.;DREIDING, A. S., HELV. CHIM. ACTA, 1983, 66, N 7, 2330-2341
作者:JACKSON, D. A.、REY, M.、DREIDING, A. S.
DOI:——
日期:——
JACKSON, D. A.;REY, M.;DREIDING, A. S., TETRAHEDRON LETT., 1983, 24, N 44, 4817-4820
作者:JACKSON, D. A.、REY, M.、DREIDING, A. S.
DOI:——
日期:——
JACKSON, D. A.;REY, M.;DRELDING, A. S., HELV. CHIM. ACTA, 1985, 68, N 2, 439-449
作者:JACKSON, D. A.、REY, M.、DRELDING, A. S.
DOI:——
日期:——
2-Vinylcyclobutanones by Cycloaddition of Vinylketenes to Simple Olefins
作者:David A. Jackson、Max Rey、Andr� S. Dreiding
DOI:10.1002/hlca.19830660744
日期:1983.11.2
methods were compared, all involving in situ generation of the ketenes 2 by HCl-elimination from α,β-unsaturated acid chlorides 1; the most effective employed a large excess of olefin 3 and a high reaction temperature. The [2+2]-cycloadditions were fully regio- and stereoselective with respect to the olefin 3, but less so with respect to the ketene 2, so that - where possible - two stereoisomers of