Nitrones in Organic Synthesis. Synthesis of Secondary Allyl Amines
作者:A. Dondoni、F. L. Merchán、P. Merino、T. Tejero
DOI:10.1080/00397919408010566
日期:1994.10
Abstract Nitrones 1 undergo addition of vinyl organomagnesium bromide to give the allyl hydroxylamines 3 which are easily reduced to the corresponding N-benzyl allyl amines 2.
Methods for the preparation of substituted homoallylic amines and their conversion to pyrrolidines or pyrrolizidines are described. N-Alkylation of a variety of homoallylic secondary amines with (tributylstannyl)methyl methanesulfonate and subsequent tin-lithium exchange, generates organolithium species that undergo intramolecular carbolithiation (anionic cyclization). High stereoselectivities in the cyclization, particularly for the formation of 2,4-disubstituted pyrrolidines, are obtained.