First asymmetric oxidation of tertiary amines by cyclohexanone monooxygenase
摘要:
Cyclohexanone monooxygenase catalyzes the asymmetric oxidation of some tertiary amines to amine N-oxides. The structure of the amine markedly influences the enantiomeric excess of products. (C) 1999 Elsevier Science Ltd. All rights reserved.
Concentrated Aqueous Peroxodicarbonate: Efficient Electrosyn‐ thesis and Use as Oxidizer in Epoxidations,
<i>S</i>
‐, and
<i>N</i>
‐Oxidations
作者:Ann‐Katrin Seitz、Philipp J. Kohlpaintner、Tim van Lingen、Marco Dyga、Fiona Sprang、Michael Zirbes、Siegfried R. Waldvogel、Lukas J. Gooßen
DOI:10.1002/anie.202117563
日期:2022.6.20
electrochemical synthesis of concentrated (≈1.0 m) peroxodicarbonate solutions was achieved by a newly designed electrolysis cell with an elaborate heat-transfer system, a ternary K2CO3/Na2CO3/KHCO3 electrolyte, and the use of high current densities of above 3 A cm−2. Peroxodicarbonate solutions were shown to be powerful and green oxidizers, permitting N- and S-oxidations as well as epoxidations.
浓缩(≈1.0 m)过氧二碳酸盐溶液的电化学合成是通过一个新设计的电解池实现的,该电解池具有精细的传热系统、三元 K 2 CO 3 /Na 2 CO 3 /KHCO 3电解质,并使用大电流3 A cm -2以上的密度。过氧二碳酸盐溶液被证明是强大的绿色氧化剂,允许N - 和S -氧化以及环氧化。
Beckett et al., Xenobiotica, 1973, vol. 3, p. 557
作者:Beckett et al.
DOI:——
日期:——
Gol'dfarb; Sworykina, Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1958, p. 748,754; engl. Ausg. S. 722, 727
作者:Gol'dfarb、Sworykina
DOI:——
日期:——
Kisaki et al., Journal of the Agricultural Chemical Society of Japan, 1959, vol. 23, p. 454
作者:Kisaki et al.
DOI:——
日期:——
Diastereospecific kinetics of nicotine<i>N</i>-oxidation in rat liver microsomes
1. In kinetic studies, both Eadie-Hofstee plots for cis- and trans-nicotine-1'-N-oxide formation from nicotine in rat liver microsomes were linear. For the formation of cis- and trans-nicotine-1'-N-oxide, the apparent K-m were 0.240 +/- 0.069 and 1.524 +/- 0.951 mM respectively. Corresponding V-max were 1.52 +/- 0.48 and 1.19 +/- 0.74 nmol/mg/min respectively.2. The formation of cis-nicotine-1'-N-oxide was greater than the formation of transnicotine-1'-N-oxide in rat liver microsomes and the intrinsic clearance of cis-nicotine-1'-N-oxide formation was 8.1-fold greater than that of trans-nicotine-1'-N-oxide formation.3. The formation of both cis- and trans-nicotine-1'-N-oxide in rat liver microsomes was inhibited by the addition of 1-(1-naphthyl)-2-thiourea or by heat-treatment of microsomes. 2-Diethylaminoethyl-2, 2-diphenylvalerate (SKF525A) and carbon monoxide did not affect these activities even at high concentrations.4. Formations of cis- and trans-nicotine-1'-N-oxide correlated significantly with each other (r = 0.862, p < 0.01). These results suggested that the same flavin-containing monooxygenase (FMO) isoform is responsible for the formation of cis- and trans-nicotine-1'-N-oxide in rat liver.