Asymmetric Transfer Hydrogenation of α-Keto Amides; Highly Enantioselective Formation of Malic Acid Diamides and α-Hydroxyamides
作者:Shweta K. Gediya、Vijyesh K. Vyas、Guy J. Clarkson、Martin Wills
DOI:10.1021/acs.orglett.1c02830
日期:2021.10.15
The asymmetric transfer hydrogenation (ATH) of α-keto-1,4-diamides using a tethered Ru/TsDPEN catalyst was achieved in high ee. Studies on derivatives identified the structural elements which lead to the highest enantioselectivities in the products. The α-keto-amide reduction products have been converted to a range of synthetically valuable derivatives.
使用系留的 Ru/TsDPEN 催化剂在高 ee 下实现了 α-酮基-1,4-二酰胺的不对称转移氢化(ATH)。对衍生物的研究确定了导致产品中最高对映选择性的结构元素。α-酮酰胺还原产物已转化为一系列具有合成价值的衍生物。
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.
Dynamic Kinetic Resolution via Dual-Function Catalysis of Modified Cinchona Alkaloids: Asymmetric Synthesis of α-Hydroxy Carboxylic Acids
作者:Liang Tang、Li Deng
DOI:10.1021/ja0255047
日期:2002.3.1
dioxolanediones was realized via a modified cinchona alkaloid-catalyzed alcoholytic opening of the dioxolanedione ring, generating a variety of optically active alpha-hydroxy esters in 91-96% ee and 61-85% chemical yield. In this dynamic kinetic resolution, the modified cinchonaalkaloid was found to serve dual catalytic roles, mediating both the rapid racemization of the 5-aryl dioxolanediones and the enantioselective
Two NADPH-dependent α-keto ester reductases (Streptomyces thermocyaneoviolaceus keto ester reductase, STKER-II and -III) were purified from S. thermocyaneoviolaceus IFO 14271, one of thermophilic actinomycetes. The molecular masses of native STKER-II and -III were estimated to be 60 kDa and 70 kDa by gel filtration chromatography, respectively. These enzymes were both homodimers, with 29-kDa and 30-kDa subunit molecular masses based on SDS polyacrylamide gel electrophoresis. STKER-II and -III were stable from pH 7.0 to 10.0 and pH 5.5 to 9.0, respectively. Ethyl 3-methyl-2-oxobutanoate was reduced by both enzymes isolated to the corresponding (R)-hydroxy ester with excellent enantiomeric excess. STKER-III showed high stereoselectivity for the reduction of bulky substrates, while the selectivity of the STKER-II-catalyzed reduction was low except for ethyl 3-methyl-2-hydroxybutanoate. Both enzymes had small Km values toward aliphatic keto esters having a long alkyl chain.
A thermoregulated phase-separable chiral Pt nanocatalyst for recyclable asymmetric hydrogenation of α-ketoesters
作者:Xiuru Xue、Yanhua Wang、Fu-She Han
DOI:10.1039/c7cc00892a
日期:——
Asymmetric hydrogenation of α-ketoesters catalyzed by a recyclable chiral Pt nanocatalyst system possessing thermoregulated phase-separation property is presented.