BF3-induced rearrangement of aziridinocyclopropanes derived from 2-phenylsulfonyl-1,3-dienes. A new approach to the tropane alkaloid skeleton
作者:Claes M.G. Löfström、Jan-E. Bäckvall
DOI:10.1016/0040-4039(96)00549-7
日期:1996.5
Five N-substituted derivatives of 1,2-methylene-3,4-aziridino 2-phenylsulfonyl cycloalkanes (3a-e) were prepared from their corresponding epoxy cyclopropanes via ring opening of the epoxide by sodium azide and subsequent triphenylphosphine induced cyclization. BF3-induced reaction of compounds 3a-e resulted in a rearrangement via a cyclopropyl carbinyl cation intermediate. In the case of tosylaziridine