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

✍ Scribed by Pindur, Ulf ;Erfanian-Abdoust, Houshang

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
337 KB
Volume
1990
Category
Article
ISSN
0947-3440

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✦ Synopsis

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.

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