Furan ring opening - indole ring closure: Synthesis of furo[2′,3′:3,4]-cyclohepta[1,2-<i>b</i>]indolium chlorides
作者:Alexander V. Butin、Sergey K. Smirnov、Tatyana A. Stroganova
DOI:10.1002/jhet.5570430315
日期:2006.5
2-acetylaminoaryldifurylmethanes or 2-aminoaryldifurylmethanes under treatment with methanolic HCl solution. The reaction proceeds in three steps: recyclization, intramolecular cyclization, and disproportionation. In this case the furan ring takes part in building up both pyrrole and seven-membered rings. The same salts can be obtained directly from 2-acetylaminobenzaldehydes and 2-methylfuran under similar
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。