Potassium borohydride, Potassium tetrahydroborate
A catalytic enantioselective 1,2-reduction of enones with potassium borohydride is catalyzed by a chiral N,N'-dioxide-Sc(III) complex catalyst under mild reaction conditions. A number of optically active allylic alcohols were obtained in very good enantioselectivities with nearly quantitative yields.
P. He, X. Liu, H. Zheng, W. Li, L. Lin, X. Feng, Org. Lett., 2012, 14, 5134-5137.