Iodine(III)-Mediated Cyclization of Unsaturated O-Alkyl Hydroxamates: Silyl-Assisted Access to α-Vinyl and α-(2-Silylvinyl) Lactams
作者:Duncan Wardrop、Maria Yermolina、Edward Bowen
DOI:10.1055/s-0031-1290750
日期:2012.4
Abstract The embodiment of lactam rings within a wealth of physiologically active natural products and pharmaceutical agents ensures that the development of synthetic methods, which facilitate the preparation of these saturated N-heterocycles, is of critical importance. Herein the development of a versatilemethod for the synthesis of 4 to 8-membered α-vinyl and α-(2-silylvinyl) lactams involving the iodine(III)-mediated
displaceable amino and imide leaving groups is described. Protonation of this reagent promotes exclusive displacement of the amino group with various neutral carbon nucleophiles. The resulting dithiophthalimides are amenable to diverse substitution reactions under basic or neutral conditions, thus enabling expedient access to structurally diverse unsymmetrical disulfides.