Abstract
Efficient electrophilic substitution reactions of indoles with various aldehydes proceed smoothly in acetonitrile using heteropoly acid (H 4[Si(W 3O 10) 3]) to afford the corresponding new indolyl crown ethers and di(indolyl)pyrazolyl methanes. H 4[Si(W 3O 10) 3] is also found to catalyze the Michael addition of indoles to α,β-unsaturated compounds for the synthesis of 3-alkylated indoles.
Published Version
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