Regio‐ and Stereoselective Synthesis of Enynyl‐Aryl Ethers Enabled by Copper/Iodide Tandem Catalysis
作者:Yun‐Bin Wu、Lin Xiao、Chun‐Li Mao、Zhong‐Lin Zang、Cheng‐He Zhou、Gui‐Xin Cai
DOI:10.1002/adsc.201900626
日期:2019.10.8
An approach to preparing enynyl‐aryl ethers from phenols and phenylacetylenes is described. This method without extra ligands, overcoming the favored Glaser‐Hay dimerization of alkyne, features a wide substrate scope (38 examples including endofolliculina and indole) and the merits of high atom and step economy, good regio‐ and stereoselectivity (Z‐isomers major) in moderate to good isolated yields
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.