Chlorination of Pyrrole. N-Chloropyrrole: Formation and Rearrangement to 2- and 3-Chloropyrrole

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Abstract

N-Chloropyrrole (2) was formed in 65–72% yield when pyrrole (1) in CCl4 was chlorinated with aqueous NaOCl. This intermediate rearranged in methanol to give chloropyrroles by two distinct reactions: a thermal rearrangement which gave 2-chloropyrrole (3) and an acid-catalyzed intermodular reaction which gave 2-chloropyrrole (3), 3-chloropyrrole (4), and 2,5-dichloropyrrole (5). Nucleophilic attack on the N-Cl bond of 2 was demonstrated by reactions in the presence of CN and SCN. In the latter case, 2-(thiocyano)pyrrole was formed.

Original languageEnglish (US)
Pages (from-to)1008-1010
Number of pages3
JournalJournal of Organic Chemistry
Volume47
Issue number6
DOIs
Publication statusPublished - Jan 1 1982

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All Science Journal Classification (ASJC) codes

  • Organic Chemistry

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