[3,2] Sigmatropic rearrangements of some allylic oxosulphonium ylides. A route to trienes and azatrienes, and their cyclic isomers
作者:Roy Faragher、Thomas L. Gilchrist、Ian W. Southon
DOI:10.1039/p19810002352
日期:——
The imidoyl-substitutedoxosulphoniumylides (2) reacted with dimethyl acetylenedicarboxylate and with di-benzoylacetylene by conjugate addition. The resulting allylic oxosulphoniumylides underwent [3,2] sigmatropic rearrangement at room temperature or below, to give the sulphoxides (3). These sulphoxides readily lost methane-sulphinic acid when heated at 80 °C and gave the dihydropyridines (4). These