Organocatalyzed α-Oxyamination of Aldehydes Using Anodic Oxidation
作者:Nhat-Nguyen Bui、Xuan-Huong Ho、Sun-il Mho、Hye-Young Jang
DOI:10.1002/ejoc.200900871
日期:2009.11
Electrochemical oxidation was performed during the organocatalyzed α-oxyamination of aldehydes by using a one-compartment electrolytic cell under galvanostatic conditions. In the presence of substoichiometric amounts of sec-amines, the desired coupling products were formed in good yield. The asymmetric variant of the α-oxyamination of aldehydes was examined by using chiral sec-amines. Control experiments
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。
Concerning the Mechanism of the FeCl<sub>3</sub>-Catalyzed α-Oxyamination of Aldehydes: Evidence for a Non-SOMO Activation Pathway
作者:Jeffrey F. Van Humbeck、Scott P. Simonovich、Robert R. Knowles、David W. C. MacMillan
DOI:10.1021/ja1043006
日期:2010.7.28
The mechanism of a recently reported aldehyde alpha-oxyamination reaction has been studied using a combination of kinetic, spectrometric, and spectrophotometric techniques. Most crucially, the use of a validated cyclopropane-based radical-clock substrate has demonstrated that carbon-oxygen bond formation occurs predominantly through an enamine activation manifold. The mechanistic details reported herein