Base-Catalyzed Cyclization of 1,6-Diynyl Carboxylates Involving Propargyl-Allenyl Isomerization: Efficient Synthesis of Benzo[<i>b</i>]fluorene and Its Analogues
作者:Ning Sun、Xin Xie、Gaonan Wang、Haoyi Chen、Yuanhong Liu
DOI:10.1002/adsc.201601074
日期:2017.4.17
An efficient protocol for the synthesis of benzo[b]fluorenes via base‐catalyzed cyclization of 1,6‐diynyl carbonates, esters or ethers has been developed. The reaction likely proceeds via base‐induced propargyl‐allenyl isomerization followed by Schmittel‐type cyclization. Heterocycle‐fused fluorenes such as thiophene‐ or pyridine‐fused substrates could also be conveniently constructed by this method
已开发出一种通过碱催化的1,6-二炔基碳酸酯,酯或醚的环化反应合成苯并[ b ]芴的有效方案。该反应可能是通过碱诱导的炔丙基-烯基异构化,然后是施密特尔型环化而进行的。杂环融合的芴,例如噻吩或吡啶融合的底物也可以通过这种方法方便地构建。该反应的合成效用通过最多制备七环稠合多环芳烃得到了证明。