Asymmetric α-oxyamination of aldehydes by synergistic catalysis of imidazolethiones and metal salts
作者:Xianrui Liang、Na Li、Xinlei Chen、Weike Su
DOI:10.1039/c4ra08556f
日期:——
Novel and efficient imidazolethione catalysts combined with metal salts were successfully introduced to the asymmetric α-oxyamination of aldehydes. The desired products with high yields and good to excellent enantioselectivities were obtained via a one-pot oxidation–oxyamination reaction system.
Peptide/Laccase Cocatalyzed Asymmetric α-Oxyamination of Aldehydes
作者:Kengo Akagawa、Kazuaki Kudo
DOI:10.1021/ol2012956
日期:2011.7.1
An asymmetric α-oxyamination could be successfully performed by a peptide catalyst and laccase. The combination of peptide catalysis and enzymatic air oxidation promoted the reaction smoothly in water without employing a metal reagent. The oxyaminated compounds could be obtained as both aldehyde and carboxylic acid products depending on the reaction conditions.
An efficient tandem reaction system was developed, in which primary alcohols were used for the oxidation to the corresponding aldehydes followed by an asymmetric alpha-oxyamination with a resin-supportedpeptidecatalyst.
The resin-supportedpeptidecatalyst having the terminal five-residue Pro-d-Pro-Aib-Trp-Trp combined with polyleucine successfully catalyzed the asymmetric α-oxyamination of aldehydes in aqueous media. The secondary structure and the chirality sense of the hydrophobic polyleucine chain significantly affected both reactivity and enantioselectivity.
具有末端五残基Pro- d -Pro-Aib-Trp-Trp和聚亮氨酸的树脂负载的肽催化剂成功地催化了水性介质中醛的不对称α-氧化胺化。疏水性聚亮氨酸链的二级结构和手性感显着影响反应性和对映选择性。