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 .
The generation and rearrangement of 2-(diazoacetyl)cyclobutanones: the formation of 5-spirocyclopropyl-2(5H)-furanones
作者:Robert D. Miller、W. Theis、G. Heilig、S. Kirchmeyer
DOI:10.1021/jo00004a022
日期:1991.2
We describe here a simple synthesis of 2-(diazoacetyl)cyclobutanones and their facile thermal rearrangement to 5-spirocyclopropyl-DELTA-alpha,beta-butenolides. The yield of the rearrangement product is high, and the reaction is completely stereospecific. alpha-Ketenylcyclobutanones have been identified spectroscopically as intermediates, and their rearrangement was studied kinetically. A strained dipolar cyclic transition is proposed for the rearrangement of the alpha-ketenylcyclobutanones to the corresponding 5-spirocyclopropyl-DELTA-alpha,beta-butenolides.
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