Tandem [2,3]sigmatropic rearrangement of a sulphonium ylide and cyclopropanation of the resulting electron-rich olefin on a 4-methoxy-2-pyrone derivative
作者:P. de March、M. Moreno-Manas、I. Ripoll、F. Florencio、S. García-Blanco、S. Martinez-Carrera
DOI:10.1016/s0040-4039(00)84878-9
日期:1986.1
of 4-methoxy-6-phenylthiomethyl-2-pyrone with dimethyldiazomalonate affords 5-(bis(methoxycarbonyl))(phenylthio)methyl-4-methoxy-6-methylene-5,6- -dihydro-2-pyrone via [2,3]sigmatropicrearrangement of the corresponding sulphur ylide. Cyclopropanation of the 6-methylene double bond occurs by the less hindered side.