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Gold-catalyzed synthesis produces polysubstituted pyrroles in ionic liquids, suggesting a greener approach.
An environmentally friendly synthesis of polysubstituted pyrroles in ionic liquid was achieved via a gold-catalyzed propargylic substitution/hydration/amination/cycloisomerization sequence. Treatment of propargylic alcohols, 1,3-dicarbonyl compounds, and arylamines in the presence of AuBr3 (5 mol%) and AgOTf (15 mol%) in [EMIM][NTf2] afforded polysubstituted pyrroles in good to high yield. This reaction involves reacting arylamine with the hydrated propargylic substitution product formed as an intermediate to yield polysubstituted pyrroles.
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Chiaki et al. (2026) studied this question.
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