Enantioselective Michael Addition of 1,3-Diketones to Arenesulfonylalkylindoles: A Flexible Gateway to Optically Active 3-sec-Alkyl-Substituted Indoles Containing a Pyrazole Skeleton

Abstract

Enantioselective Michael addition of 1,3-diketones to alkylideneindolenines generated in situ from arenesulfonylalkylindoles is described, and a series of optically active C3-alkyl-substituted indole derivatives has been obtained. The resulting adducts can be readily converted into 3-sec-alkyl-substituted indoles containing a pyrazole skeleton, with direct connection between the α- and 4-positions, without decrease of the enantioselectivity.

Key words

asymmetric catalysis - Michael addition - arenesulfonylalkylindoles - 1,3-diketones - pyrazoles

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