Hydro-amination/-amidation of 1,3-diynes with indoles/azoles/amides under modified Ullmann conditions: stereo- and regio-selective synthesis of N-alkenynes via N–H bond activation
作者:Sahaj Gupta、Piyush K. Agarwal、Mohammad Saifuddin、Bijoy Kundu
DOI:10.1016/j.tetlet.2011.08.079
日期:2011.11
An efficient strategy for the stereo- and regio-selective synthesis of N-alkenynes has been described. The salient feature of the reaction involves hydro-amination/amidation of 1,3-diynes with indoles/azoles/amides via transition-metal catalyzed activation of N-H bond. The resulting N-alkenynes derived from N-heterocycles and cyclic amides were obtained as a mixture of Z/E isomers with Z-stereoselectivity ranging from 60% to 95%. In contrast, acyclic amides afforded N-alkenynes with exclusive E-stereoselectivity, albeit in reduced yield ranging from similar to 10% to 41%. (C) 2011 Elsevier Ltd. All rights reserved.