Synthesis of 3,4-disubstituted piperidines by ene cyclisation of 4-aza-1,7-dienes
作者:Stephen M. Walker、Jodi T. Williams、Alexander G. Russell、John S. Snaith
DOI:10.1016/j.tetlet.2005.08.002
日期:2005.9
Ene cyclisation of a variety of 4-aza-1,7-dienes affords 3,4-disubstituted piperidines. In particular, cyclisation of diesters 14 and 20 catalysed by MeAlCl2 gives the corresponding trans 3,4-disubstituted piperidines with diastereomeric ratios of > 200:1. (c) 2005 Elsevier Ltd. All rights reserved.