Trapping highly reactive dipolarophiles. Exploiting the mechanism associated with the azomethine ylide strategy for β-lactam synthesis
作者:Giles A. Brown、Kirsty M. Anderson、Jonathan M. Large、Denis Planchenault、Dominique Urban、Neil J. Hales、Timothy Gallagher
DOI:10.1039/b103271m
日期:——
Highlyreactive thioaldehydes 7, which are generated transiently by thermolysis of thiosulfinates 6, are trapped using azomethine ylide (derived from the β-lactam based oxazolidinone 1) to give 2-substituted penams 8. Diethyl thioxomalonate 10 and the selenoxo analogue 13, both of which are generated transiently via a retro Diels–Alder reaction, undergo 1,3-dipolar cycloaddition reactions with 1 to