Chiral Bronsted Acid-Catalyzed Friedel-Crafts Reaction of Indoles
Pinaki S. Bhadury and Jun PangAffiliation:
Northern Chem Inc., 4, 6, 7-5743 Thorold Stone Rd., Niagara Falls, ON-L2J 1A1, Canada.
AbstractThe indole network has been identified as an important pharmacophore of several natural products and synthetically prepared molecules. Asymmetric organocatalytic Friedel-Crafts alkylations of electron rich indoles are of enormous significance for the synthesis of many bioactive compounds, natural products and anti-cancer drugs. Chiral BrØnsted acid-catalyzed Friedel-Crafts-type reactions of indole and its derivatives with various carbon-centered electrophiles e.g. electron deficient olefins, carbonyls, imines and some substituted methanamines and carbinols have been employed to prepare optically active indole derivatives. These reactions, their stereochemical outcome and probable modes of activation of the substrates by suitably substituted axially dissymmetric BINOL-derived chiral BrØnsted acid catalysts are discussed in this review.
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