The synthesis of a chiral NADH model in pyrrolo[3,4-b]pyridine series is described and the asymmetricreduction of methylbenzoylformate is studied. Its asymmetric behavior compared with a cyclized analogue in naphthyridine series suggests that the orientation of the carbonyl group of the lactam plays an important role in the stereochemical control of the reduction.
Chiral NADH models with restricted or blocked rotation at the amide function: attempts to interpret the mechanism of the enantioselective hydrogen transfer to methyl benzoylformate
Various NADHmodels with the following characteristics were studied and compared with previously reported models: (1) use of (S)-phenylalaninol as chiral auxiliary; (2) orientation in or out of the plane of the amide carbonyl. Despite the occurrence of apparently similar characteristics, they gave very different results in the asymmetricreduction of methyl benzoylformate. A detailed NMR study was