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3-(1-Arylsulfonylalkyl)indoles as electrophiles in the N-heterocyclic carbene-catalyzed umpolung reaction of aldehydes were realized for the first time. This intermolecular Stetter-type reaction features the commercially available catalyst and mild reaction conditions, providing alpha-(3-indolyl) ketone derivatives in high yields for a wide range of substrates.
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Li et al. (2009) studied this question.
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