Liebigs Annalen der Chemie

Diels??Alder reactions of 1??phenylpyrano [3, 4??b] indol??3??ones with alkynes: New functionalized carbazoles

U Pindur, H Erfanian??Abdoust

Index: Pindur, Ulf; Erfanian-Abdoust, Houshang Liebigs Annalen der Chemie, 1990 , # 8 p. 771 - 773

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Citation Number: 2

Abstract

Abstract 3-Indolylalkanoic acids 2 react with benzoic acid anhydride under catalysis of Et 2 O-ZnCl 2 and mild conditions to furnish the 1-phenyl-substituted pyrano [3, 4-b] indol-3-ones 1c, 1d, and 3a, 3b. Products 1c, 1d, and 3b may be converted into the novel functionalized carbazoles 4 and 5 by reaction with acceptor-substituted alkynes.