A variety of indoles underwent enantioselective Friedel-Crafts alkylation with alpha,beta-unsaturated acyl phosphonates in the presence of 10 mol% chiral BINOL-based phosphoric acid and subsequent treatment with methanol and DBU to give methyl 3-(indol-3-yl)propanoates in good yields and with high enantioselectivities.
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Bachu et al. (2010) studied this question.
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