Abstract

Acyloxyborohydrides are unsurpassed in their versatility as reagents in organic synthesis. In addition to their superior ability in effecting reductive amination of aldehydes and ketones, acyloxyborohydrides can reduce nitrogen heterocycles (indoles, quinolines, isoquinolines), imines, enamines, oximes, amides, nitriles, benzylic alcohols, aryl ketones, aldehydes (but not ketones), acetals, β-hydroxy ketones, and other substrates. The ability to control chemoselectivity, regioselectivity, and stereoselectivity by adjusting the carboxylic acid, borohydride reagent, stoichiometry, and temperature has no parallel in the repertoire of the organic chemist.

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