ketones have been synthesized by the reduction of the corresponding ketones with a keto ester reductase isolated from bakers’ yeast (YKER-I). The reduction of α-keto esters affords the corresponding (S)- or (R)-hydroxy esters selectively, where the stereochemical course depends on the chain length of the alkyl substituent on the carbonyl group. An α-keto short alkanoic ester affords the corresponding
Investigation on the Regioselectivities of Intramolecular Oxidation of Unactivated C−H Bonds by Dioxiranes Generated in Situ
作者:Man-Kin Wong、Nga-Wai Chung、Lan He、Xue-Chao Wang、Zheng Yan、Yeung-Chiu Tang、Dan Yang
DOI:10.1021/jo0347011
日期:2003.8.1
state. The intramolecularoxidation of ketone 6 showed the preference for a tertiary delta C-H bond over a secondary one. This intramolecularoxidation method can be extended to the oxidation of the tertiary gamma' C-H bond of ketones 9 and 10. For ketone 11 with two delta C-Hbonds and one gamma' C-H bond linked respectively by a sp(3) hydrocarbon tether and a sp(2) ester tether, the oxidation took place
Reductive biotransformation of carbonyl compounds—application of fungus, Geotrichum sp. G38 in organic synthesis
作者:Gu Jian-Xin、Li Zu-Yi、Lin Guo-Qiang
DOI:10.1016/s0040-4020(01)87947-3
日期:1993.6
The microbial transformation of 2- and 3-oxo esters and diketones with Geotrichum sp. G38 and its application to the syntheses of the key intermediates of several bioactive compounds such as (R)-denopamine 8, (R)-fluoxetine 11 and (2S, 3R)-sitophilate 14 were described.
enhancement of the reactivity were achieved in the bakers' yeastreduction of the α- and β-keto ester derivatives by the addition of a sulfur compound. High enantioselectivity in the bakers' yeastreduction of keto esters was accomplished by using combination of an addition of a sulfur compound with an appropriate selection of the alcohol part of the ester.
Asymmetric Synthesis of
<i>N</i>
‐Substituted α‐Amino Esters from α‐Ketoesters via Imine Reductase‐Catalyzed Reductive Amination
作者:Peiyuan Yao、James R. Marshall、Zefei Xu、Jesmine Lim、Simon J. Charnock、Dunming Zhu、Nicholas J. Turner
DOI:10.1002/anie.202016589
日期:2021.4.12
N‐Substituted α‐amino esters are widely used as chiral intermediates in a range of pharmaceuticals. Here we report the enantioselective biocatalyic synthesis of N‐substituted α‐amino esters through the direct reductive coupling of α‐ketoesters and amines employing sequence diverse metagenomic imine reductases (IREDs). Both enantiomers of N‐substituted α‐amino esters were obtained with high conversion