An efficient method for the construction of furo[2,3-b]indole derivatives 5 via an isocyanide-based multicomponent reaction (I-MCR) and a copper-catalyzed intramolecular Ullmann reaction sequence was described. This two-step sequence can be performed in a one-pot manner to produce the desired product 5 in moderate to good yield (up to 90%). (C) 2011 Published by Elsevier Ltd.
合成了一系列N 2 , N 8 -双(含氮杂环)-yl-2,8-二甲酰胺-Tröger碱。最有效的一种,N 2 , N 8 -di(4 H -1,2,4-triazol -4-yl)-6 H ,12 H -5,11-methanodibenzo[ b , f ][1,5] diazocine-2,8-dicarboxamide ( 4d ),用作双功能催化剂,促进色烯[3',4':4,5]呋喃[2,3- b ]吲哚的一步一锅法制备或萘[2',3':4,5]呋喃[2,3- b] 吲哚与 CuI 通过 4-羟基香豆素(或 2-羟基-1,4-萘醌)、取代的苯甲醛和异氰化物的级联 Aldol-[4 + 1] 环加成-分子内 Ullmann 反应。通过1 H NMR 滴定和对照实验研究了合理的催化机理。 图形概要