Synthesis of tetracyclic system of 2,4-di(tert-butyl)-6,7-dihydrofuro[2′,3′:3,4]cyclohepta[1,2-b]indole
作者:Alexander V. Butin、Olga N. Kostyukova、Fatima A. Tsiunchik、Maxim G. Uchuskin、Olga V. Serdyuk、Igor V. Trushkov
DOI:10.1002/jhet.635
日期:2011.5
For the first time, tetracyclic compounds, namely, furo[2′,3′:3,4]cyclohepta[1,2‐b]indoles were synthesized by recyclization of ortho‐substituted aryldifurylmethanes containing tert‐butyl groups at C5 positions of the furan rings. It was shown that [2‐(benzoylamino)phenyl]bis(5‐tert‐butyl‐2‐furyl)methanes 12 are transformed into tetracycles 15 at room temperature under treatment with POCl3 in benzene