Under smooth Eu(fod)3-catalyzed conditions, the inverse-electron demand hetero-Diels−Alder reactions between enantiopure N-vinyl-2-oxazolidinones 1a−f and representative β,γ-unsaturated α-ketoesters proceed with a high degree of endo and facial diastereoselectivity. The elucidation of the stereostructure of these adducts, performed by X-ray analysis or chemical correlation, shows that the endo-selective
Preparation of Chiral<i>N</i>-Vinyl Oxazolidinones by a Simple General Procedure
作者:Robert Dhal、Catherine Gaulon、Gilles Dujardin
DOI:10.1055/s-2003-41443
日期:——
A high yielding, general, and practical procedure for the N-vinylation of 2-oxazolidinones via TMSOTf-promoted dehydroalkoxylation of N,O-acetals is described.