Organic Reactions in Ionic Liquids: A Simple and Highly Regioselective N-Substitution of Pyrrole

 

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Abstract

In ionic liquids [Bmim][PF₆] or [Bmim][BF₄], pyrrole replaced the halogen atom of an alkyl halide to give the corresponding N-substituted pyrrole in excellent yield. Benzenesulfonyl chloride, p-methylbenzenesulfonyl chloride and benzoyl chloride reacted similarly with pyrroles to afford the N-substituted pyrroles in quantitative yield. Michael addition reaction of pyrrole with electrophilic olefins was completed in a highly regioselective manner to afford the N-alkylpyrroles.

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