Copper-Catalyzed Synthesis of Furo[3,2-c]coumarins and Dihydrofuro[3,2-c]coumarins through a Propargylation/Alkyne Oxacyclization/Isomerization Cascade under Microwave Irradiation
作者:Jian-Wu Xie、Hai-Lei Cui、Xiao-Yan Zhang、Li-Li Hu、Ze Shen、Zhong-Zhu Chen、Zhi-Gang Xu、Shi-Qiang Li
DOI:10.1055/s-0035-1560500
日期:——
A novel copper-catalyzed microwave-promoted propargylation/alkyne oxacyclization/isomerization cascade for the synthesis of 2-methylfuro[3,2-c]coumarins has been developed. This reaction provides furo[3,2-c]coumarins in moderate to good yields (≤82%) from readily available 4-hydroxycoumarins and terminal propargyl acetates as starting materials. Interestingly, by changing the solvent from dimethyl
已开发出一种用于合成 2-甲基呋喃 [3,2-c] 香豆素的新型铜催化微波促进炔丙基化/炔氧杂环化/异构化级联。该反应以容易获得的 4-羟基香豆素和末端乙酸炔丙酯为起始原料,以中等至良好的产率 (≤82%) 提供呋喃 [3,2-c] 香豆素。有趣的是,通过将溶剂从二甲亚砜改为 1,2-二氯乙烷,2-亚甲基-2,3-二氢呋喃 [3,2-c] 香豆素的异构系列以良好的收率(≤85%)获得。