reaction performed on-column in a microcapillary were comparable to standard reaction conditions, however, we were able achieve catalysis and analysis in a single step in less than 30 min. The throughput can be increased by simultaneous investigation of different substrates without increasing the overall analysis time. Use of di-deuterated Hantzsch ester allowed us to investigate the kinetic isotope
This paper reports the design of a new axially chiral NADH model which relies on the configurational control around the C3-C-O chiral axis by means of a chiral relay installed on the cyclic structure. The conformational and configurational control of the lactam moiety was successfully achieved affording two conformational diastereoisomers (aS,S)-1 and (aR,S)-1 in a ratio of 95:5, respectively. Reduction of methyl benzoylformate with model 1 afforded (R)-methyl mandelate in up to 84% e.e. The stereoselective synthesis of 4-deuterated model 1 allowed us to establish that this enantioselective reduction arises from the migration of the syn-oriented hydrogen with regard to the carbonyl dipole. (C) 2001 Elsevier Science Ltd. All rights reserved.
Catalytic Asymmetric Reaction with Water: Enantioselective Synthesis of α-Hydroxyesters by a Copper–Carbenoid OH Insertion Reaction
作者:Shou-Fei Zhu、Chao Chen、Yan Cai、Qi-Lin Zhou
DOI:10.1002/anie.200704651
日期:2008.1.18
FUSNIMI MAKOTO; BABA NAOMISNI; ODA JUNISNI; INOUUE YUZO, BULL. INST. CHEM. RES. KYOTO UNIV., 1980, 58, NO 3, 357-365
作者:FUSNIMI MAKOTO、 BABA NAOMISNI、 ODA JUNISNI、 INOUUE YUZO
DOI:——
日期:——
Retention of Optical Purity in H-D Exchange Reactions Catalysed by Cobalt-Aluminium Alloy in Na<sub>2</sub>CO<sub>3</sub>-D<sub>2</sub>O
Co-Al alloy in a sodium carbonate-deuterium oxide solution catalyzes the H-D exchange reaction of optically active benzylic hydrogen atom without racemization.