Intramolecular cycloadditions of nitrones joined by amides to olefins
作者:R. Brambilla、R. Friary、A. Ganguly、M.S. Puar、B.R. Sunday、J.J. Wright、Kay D. Onan、Andrew T. Mcphail
DOI:10.1016/s0040-4020(01)98890-8
日期:1981.1
Six nitrones joined by amides to olefins were prepared in situ from the related ketones 1–3 with N-methy]- and benzylhydroxylamines. The nitrones added intramolecularly to the olefins, and the cycloadditions gave the 6-lactams 4–9 stereoselectively and regiospecifically. Chemical correlations, CMR spectroscopy and two X-ray crystallographic analyses established that the relative stereochemistries of