MASTERS, A. P.;SORENSEN, T. S., TETRAHEDRON LETT., 30,(1989) N3, C. 5869-5872
作者:MASTERS, A. P.、SORENSEN, T. 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