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Free keywords:
chemoselectivity; Hantzsch dihydropyridine; iminium salts; organocatalysis; transfer hydrogenation
Abstract:
Impressive tolerance is displayed in the efficient and chemoselective organocatalytic transfer hydrogenation of α,β‐unsaturated aldehydes in the presence of a Hantzsch dihydropyridine and a catalytic amount of dibenzylammonium trifluoroacetate (see scheme). Various sensitive functional groups such as the nitro, cyano, alkenyl, and benzyloxy groups survive these reaction conditions.