Abstract
An asymmetric Friedel-Crafts C2-alkylation between 3-substituted indoles and imines catalyzed by chiral BINOL-derived disulfonimides (DSIs) has been developed. This reaction tolerated a wide range of 3-substituted indoles and imines, affording a series of chiral 2-indolyl methanamine derivatives in good yields with good to excellent enantioselectivities (up to 98% ee). This is a useful protocol for the direct synthesis of 2-indolyl methanamine derivatives. It is worth noting that increasing the temperature in this reaction could result in a better enantioselectivity, making it different from the other common organocatalytic systems.
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