Synthesis of New Heterocycles through a Cation-Driven Tandem Ring-Enlargement−Annulation Reaction
作者:Angela M. Bernard、Enzo Cadoni、Angelo Frongia、Pier P. Piras、Francesco Secci
DOI:10.1021/ol026199x
日期:2002.7.1
[GRAPHICS]The thionium ion, generated through a cyclopropylcarbinyl-cyclobutyl ring expansion, is, for the first time, intramolecularly intercepted by activated aromatic rings to generate new versatile 2a-methyl-8b-(phenylsulfanyl-1,2a,3,8b-tetrahydro-2H-cyclobuta[c]chromenes.