1,3-acyloxy migration of propargyl α-ketoesters and a carbonyl-ene cyclization of in situ generated allenyl esters. DFT calculations suggest that the copper salt might play dual roles as both chloride abstractor facilitating the generation of highly active gold catalyst and Lewis acid promoting the stepwise intramolecular carbonyl-enereaction.
已经开发了一种双金属协议,以从容易获得的炔丙基 α-酮酯构建 ( Z )-γ-亚烷基丁烯内酯化合物。它涉及金催化的炔丙基α-酮酯的1,3-酰氧基迁移和原位生成的丙二烯酯的羰基-烯环化。DFT 计算表明,铜盐可能起到双重作用,即促进高活性金催化剂生成的氯化物提取剂和促进逐步分子内羰基-烯反应的路易斯酸。
Palladium-catalyzed one-pot synthesis of polysubstituted furans from alkynoates and 2-yn-1-ols
作者:Huawen Huang、Huanfeng Jiang、Hua Cao、Jinwu Zhao、Dabin Shi
DOI:10.1016/j.tet.2011.12.033
日期:2012.4
Easily accessible propargyl vinyl ethers are found to be acyclic precursors to construct furan derivatives. According to the reactive behavior of the substrates and the regulation of reaction conditions, three synthetic routes to polysubstituted furans via palladium-catalyzed reactions of propargyl vinyl ethers in situ-prepared from alkynoates and 2-yn-1-ols are presented herein. These methods could have potential application in synthetic and pharmaceutical chemistry for its facilitation and accessible starting materials. (C) 2011 Elsevier Ltd. All rights reserved.