Photoinduced vinylcyclopropane-cyclopentene rearrangement: A methodology for chiral bicyclo[3.2.0]heptenes. Formai syntheses of (±)-grandisol and naturally occurring ()-Δ9(12)-Capnellene and its antipode
作者:Harikisan R. Sonawane、Vishwaniyant G. Naik、Nanjundiah S. Bellur、Virendra G. Shah、Pramod.C. Purohit、M.Uday Kumar、Dilip G. Kulltarni、Jaimala R. Ahuja
DOI:10.1016/s0040-4020(01)91019-1
日期:1991.9
The problem of achieving reaction selectivity in -alkyl vinylcyclopropanes in favour of their rearrangement to cyclopentenes, obviating the competing low energy process of the [1,5] (homo) sigmatropic hydrogen shift, is addressed. It has been demonstrated that the readily available bicyclo[4.1.0]heptenes derived from (+)-Δ3-carene. (1), upon photosensitized irradiation, are conveniently transformed