A Novel Photochemical Vinylcyclopropane Rearrangement Yielding 6,7-Dihydro-5<i>H</i>-benzocycloheptene Derivatives
作者:Diego Armesto、Ana Ramos、Elena P. Mayoral、Maria J. Ortiz、Antonia R. Agarrabeitia
DOI:10.1021/ol991277a
日期:2000.1.1
[reaction: see text] 1-Substituted 1-(2,2-diphenylvinyl)cyclopropanes with electron-accepting groups at C1 undergo a novelrearrangement to benzocycloheptenes on triplet-sensitized irradiation. In some instances competition between rearrangement to cyclopentenes and formation of cycloheptenes takes place. When electron-acceptor groups are not present at C1, conventional ring opening to cyclopentenes