Preparation of optically pure (3E,5E)-alkyl-2-hydroxy-6-arylhexa-3,5-dienoates by Candida parapsilosis ATCC 7330 mediated deracemisation of the racemates
摘要:
Biocatalytic deracemisation of a range of racemic (3E,5E)-alkyl-2-hydroxy-6-arylhexa-3,5-dienoates using Candida parapsilosis ATCC 7330 resulted in pure (S)-enantiomers in yields of up to 80% and ee > 99%. (C) 2007 Elsevier Ltd. All rights reserved.
Copper-Catalyzed Enantioselective Hetero-Diels–Alder Reaction of Danishefsky’s Diene with β,γ-Unsaturated α-Ketoesters
作者:Yanbin Hu、Kun Xu、Sheng Zhang、Fengfeng Guo、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/ol5015009
日期:2014.7.3
A highly enantioselective hetero-Diels–Alder reaction of Danishefsky’s diene with β,γ-unsaturatedα-ketoesters was developed for the first time by virtue of chiral copper complexes. This protocol provided a facile access to optically active dihydropyranones bearing a quaternary center with high enantioselectivities and good yields. Furthermore, on the basis of the isolated intermediate analysis, the
Copper-Catalyzed Enantioselective Henry Reaction of β,γ-Unsaturated α-Ketoesters with Nitromethane in Water
作者:Yanan Li、Yekai Huang、Yang Gui、Jianan Sun、Jindong Li、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.orglett.7b03299
日期:2017.12.1
A highly enantioselective Henry reaction of β,γ-unsaturated α-ketoesters with nitromethane in water by virtue of chiral copper complexes has been developed. A series of unsaturated β-nitro-α-hydroxy esters bearing tetrasubstituted carbon stereocenters were obtained exclusively with high yields and excellent enantioselectivities. This method could avoid tedious anaerobic anhydrous manipulation and reduce
Selective Reduction of the Carbonyl Group in β,γ-Unsaturated α-Ketoesters by Transfer Hydrogenation with Ru-TsDPEN
作者:Zhaoguo Zhang、Minjie Guo、Dao Li、Yanhui Sun
DOI:10.1055/s-2004-817765
日期:——
A convenient and practical method for the selective reduction of C=O bond of a wide spectrum of α-keto β,γ-unsaturated esters via transfer hydrogenation reaction under the catalysis of Ru(p-cymene)(TsDPEN) (TsDPEN: monotosylated 1,2-diphenylethylene-1,2-diamine) was developed.