A practical method for using alkoxide-accelerated vinylcyclobutane ring expansions in the synthesis of six-membered rings. Unexpected orbital symmetry allowed and forbidden 1,3-sigmatropic rearrangements
1-Methoxy-1-(phenylthio)cyclopropanes from olefins via the Pummerer rearrangement
作者:M. Bhupathy、Theodore Cohen
DOI:10.1016/s0040-4039(00)96628-0
日期:1987.1
The Pummererrearrangements of cyclopropyl(methoxy)phenylsulfonium salts proceed via sulfur-stabilized carbocations to yield the title compounds. The sulfoniumsalts were prepared in high yields from olefins via carbene addition, oxidation, and methylation.
Photochemical Reactions. 125th communication [1]. Photochemistry of homoconjugated cyclobutanones. I. Synthesis and photolysis of a Spiro [3.6]deca-5, 7-dien-1-one
作者:Terry A. Lyle、Bruno Frei
DOI:10.1002/hlca.19810640816
日期:1981.12.16
The title compound 4 was prepared in 54% overall yield from eucarvone (5). On triplet sensitization 4 gives two products resulting from a 1,2-acyl shift (8 and 9), whereas singlet excitation of 4 causes decarbonylation and ketene elimination (4 10 and 11).