从2-乙酰氨基芳基二呋喃甲烷甲烷或2-氨基芳基二呋喃甲烷甲烷经HCl甲醇溶液处理,详细阐述了呋喃[2',3':3,4]环庚[1,2- b ]吲哚氯化物的新合成方法。反应按三个步骤进行:再循环,分子内环化和歧化。在这种情况下,呋喃环参与构建吡咯和七元环。可以在类似条件下直接从2-乙酰氨基苯甲醛和2-甲基呋喃获得相同的盐,而无需分离相应的2-乙酰氨基芳基二呋喃甲烷。
Synthesis of 2,4‐difuryl‐4
<i>H</i>
‐3,1‐benzothiazines via a furan ring migration reaction
作者:Vladimir T. Abaev、Fatima A. Tsiunchik、Alexander V. Butin、Andrey V. Gutnov
DOI:10.1002/jhet.5570450227
日期:2008.3
Abstractmagnified imageA new simple synthetic approach to 2,4‐difuryl‐4H‐3,1‐benzothiazines from 2‐isothiocyanoaryldifuryl‐methanes in the presence of acidic catalyst is described. This rearrangement is a new example of furan ring migration reaction resulting from intramolecular attack with electrophilic carbon.