Stereospecific 4-Hydrogen Transfer in the Asymmetric Reduction Using (<i>S</i><sub>S</sub>)-3-(<i>p</i>-Tolylsulfinyl)-1,4-dihydropyridines, NADH Model Compounds
In asymmetric reduction of ketones with (SS)-1-benzyl-3-(p-tolylsulfinyl)-1,4-dihydropyridine as a NADHmodelcompound, a stereospecific transfer of the 4-hydrogen was experimentally proved by the use of the 2-methyl congener and the 4-deuterated derivatives.
Studies on novel and chiral 1,4-dihydropyridines. IV. Mechanistic aspects of the asymmetric reduction with chiral NADH model compounds, (S)-3-(p-tolylsulfinyl)-1,4-dihydropyridines
In the reduction of ketones with NADH mimics, (SS)-1-substituted 3-(p-tolylsulfinyl)-1,4-dihydropyridines1, the stereospecific transfer of one of the C-4 hydrogens, which is syn to the SO bond, was experimentally revealed to be involved by employing the 2-methyl derivative 2 and the 4-deuterated derivatives 3a and 3b. The transition state model of this reaction was also proposed by consideration of