Regio- and stereoselective multi-enzymatic aminohydroxylation of β-methylstyrene using dioxygen, ammonia and formate
作者:Maria L. Corrado、Tanja Knaus、Francesco G. Mutti
DOI:10.1039/c9gc03161h
日期:——
A multi-enzymatic aminohydroxylation of β-methylstyrene affords 1R,2R and 1S,2R-phenylpropanolamines in excellent chemical and optical purity by consuming dioxygen, ammonia and formate in aqueous buffer and ambient temperature.
biocatalysts for the synthesis of β‐substituted alcohols based on their epoxide ring‐opening activity with a number of small anionic nucleophiles. In an attempt to further broaden the scope of substrates accepted by these enzymes, a panel of 22 HHDHs was investigated in the conversion of aliphatic and aromatic vicinally di‐substituted trans‐epoxides using azide as nucleophile. The majority of these HHDHs
Enantioselective Synthesis of Cyclic Sulfamidates by Using Chiral Rhodium-Catalyzed Asymmetric Transfer Hydrogenation
作者:Soyeong Kang、Juae Han、Eun Sil Lee、Eun Bok Choi、Hyeon-Kyu Lee
DOI:10.1021/ol1017905
日期:2010.9.17
Asymmetric transfer hydrogenation (ATH) of cyclic sulfamidate imines 4 and 9, using a HCO2H/Et3N mixture as the hydrogen source and well-defined chiral Rh catalysts (S,S)- or (R,R)-2, Cp*RhCl(TsDPEN), effectively produces the corresponding cyclic sulfamidates with excellent yields and enantioselectivities at room temperature within 0.5 h. ATH of 4,5-disubstituted imines 9, having preexisting stereogenic
使用HCO 2 H / Et 3 N混合物作为氢源和定义明确的手性Rh催化剂(S,S)-或(R,R)-2,对环状氨基磺酸亚胺4和9进行不对称转移氢化(ATH), Cp * RhCl(TsDPEN)可在室温下0.5h内以优异的收率和对映选择性有效生产相应的环状氨基磺酸酯。具有预先存在的立体生成中心的4,5-二取代的亚胺9的ATH显示以动态动力学拆分发生。
Asymmetric synthesis of l-DOPA and (R)-selegiline via, OsO4-catalyzed asymmetric dihydroxylation
作者:Iliyas Ali Sayyed、Arumugam Sudalai
DOI:10.1016/j.tetasy.2004.08.007
日期:2004.10
A simple and effective procedure for the enantioselective synthesis of two important neurotransmitter drugs, hat is, (S)-3,4-dihydroxyphenylalanine (L-DOPA) and (R)-N,alpha-dimethyl-N-2-propynylbenzeneethaneamine [(R)-selegiline], is described by employing the Sharpless asymmetric dihydroxylation (AD) as a key step to introduce chirality. (C) 2004 Elsevier Ltd. All rights reserved.
Chemoenzymatic synthesis of chiral β-azidoalcohols. Application to the preparation of chiral aziridines and aminoalcohols
From the microbiological reduction of 3-azido-2-octanone, 3-azido-4-phenyl-2-butanone and 1-azido-1-phenyl-2-propanone, homochiral isomers of the corresponding beta-azidoalcohols were prepared. These ''alpha-bichiral'' synthons were used to prepare all the stereoisomers of 2-methyl-3-n-pentylaziridine and 2-methyl-3-benzylaziridine and some homochiral aminoalcohols.