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Featured researches published by Naomichi Baba.


Tetrahedron Letters | 1979

Role of hydroxyl groups in the stereochemistry of hydrogen transfer from chiral NAD(P)H model to carbonyl

Taketoshi Makino; Tetsuji Nunozawa; Naomichi Baba; Jun'ichi Oda; Yuzo Inouye

Abstract Asymmetric reduction of α-ketoester with a chiral dihydronicotinamide was significantly affected by chiral aromatic additives, capable of exerting an attractive interaction with dihydropyridine ring, which was further consolidated through with magnesium.


Bioorganic Chemistry | 1984

Asymmetric reduction of ethyl benzoylformate with chiral NADH model systems: Mechanistic and stereochemical consideration of the reactions based on the complexation properties of the model compounds

Masaki Amano; Naomichi Baba; Jun'ichi Oda; Yuzo Inouye

Abstract Asymmetric reductions of ethyl benzoylformate were conducted by use of NADH model compounds with C1 or C2 symmetry in the presence of magnesium perchlorate. It was found that NADH model compounds which form 2 : 1 chelation complexes with the magnesium ion showed the dependence of optical yield on the reaction conversion. The stereochemical behaviors of the model compounds were classified into three reaction types on the basis of the component ratio in the chelation complex between the reductants and the magnesium ion.


Agricultural and biological chemistry | 1985

NADH Model Reaction: Asymmetric Reduction of Non-activated Carbonyl Compounds with N-Anionized Hantzsch Ester

Motoshi Watanabe; Makoto Fushimi; Naomichi Baba; Jun'ichi Oda; Yuzo Inouye

As model compounds for NADH coenzymes, three chiral Hantzsch ester-type dihydro-pyridines were prepared. By their use and 2,6-dimethyl-3,5-dicarbo-( — )-menthoxy-1,4-dihydropyridine that had already been prepared, asymmetric reductions of unactivated prochiral ketones were conducted under the action of alkali metal derivatives at room temperature in a non-polar solvent, and the alcohol product were obtained in a 36~80% chemical yield and 30~60% enantiomeric excess.


Tetrahedron Letters | 1978

Asymmetric reduction of aryl trifluoromethyl ketones with an achiral NADH model compound in a chiral hydrophobic binding site of sodiumcholate micelle, β-cyclodextrin and bovine serum albumin

Naomichi Baba; Yasuo Matsumura; Toyonari Sugimoto


Agricultural and biological chemistry | 1988

Enzymatic Resolution of Racemic Hydroperoxides in Organic Solvent

Naomichi Baba; Mitsuo Mimura; Jun Hiratake; Katsuhiro Uchida; Jun'ichi Oda


Agricultural and biological chemistry | 1986

Asymmetric Epoxidation of Cyclic Enones under Chiral Phase Transfer Conditions

Naomichi Baba; Jun'ichi Oda; Mamoru Kawaguchi


Asymmetric Synthesis | 1983

4 – Reductions with Chiral Dihydropyridine Reagents

Yuzo Inouye; Jun'ichi Oda; Naomichi Baba


Angewandte Chemie | 1982

Dependence of the Enantioselectivity on the Relative Concentration of Substrate in an NADH Model Reaction

Naomichi Baba; Jun'ichi Oda; Yuzo Inouye


Agricultural and biological chemistry | 1982

Asymmetric Reduction with Bis(NADH) Model Compounds

Fumitoshi Hoshide; Satoshi Ohi; Naomichi Baba; Jun'ichi Oda; Yuzo Inouye


Israel Journal of Chemistry | 1979

Asymmetric Reactions in Chiral Hydrophobic Binding Sites

Toyonari Sugimoto; Naomichi Baba

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