Synthesis of substituted tetrahydropyridines by cyclizations of silicon-containing iminium ions
作者:G.William Daub、Dirt A. Heerding、Larry E. Overman
DOI:10.1016/s0040-4020(01)86645-x
日期:1988.1
stereoselectively from the cyclization of silicon-containing iminium cations 5 if the nitrogen substituent R1 is an alkyl group. In contrast, cyclization of the corresponding NH or N-acyl iminiumions occurs in a stereorandom fashion. Nonracemic tetrahydropyridines cannot be prepared in this way, since both iminiumion and N-acyliminium ion intermediates racemize prior to cyclization.