Biocatalytic Promiscuity of Lipase in Chemoselective Oxidation of Aryl Alcohols/Acetates: A Unique Synergism of CAL-B and [hmim]Br for the Metal-Free H<sub>2</sub>O<sub>2</sub> Activation
作者:Upendra K. Sharma、Nandini Sharma、Rakesh Kumar、Rajesh Kumar、Arun K. Sinha
DOI:10.1021/ol901917e
日期:2009.11.5
A unique synergistic combination of lipase and ionic liquid [hmim]Br is reported for metal-free H2O2 activation, which is the first example of biocatalytic promiscuity of CAL-B for chemoselective oxidation of aryl alcohols/acetates. The catalytic system exhibits excellent functional group compatibility under neutral conditions besides reusability up to ten cycles thereby making the process economically and environmentally viable.
Steric factors in amide-directed metalations of N,N-dialkyl-6-methoxynaphthalene-2-carboxamides: synthesis of a sterically perturbed acylnaphthol
作者:Rajeshwar D. Bindal、John A. Katzenellenbogen
DOI:10.1021/jo00391a001
日期:1987.7
BINDAL, RAJESHWAR D.;KATZENELLENBOGEN, J. A., J. ORG. CHEM., 52,(1987) N 1, 3181-3185
作者:BINDAL, RAJESHWAR D.、KATZENELLENBOGEN, J. A.
DOI:——
日期:——
US4902799A
申请人:——
公开号:US4902799A
公开(公告)日:1990-02-20
Catalytic Ring-Opening of Cyclic Alcohols Enabled by PCET Activation of Strong O–H Bonds
作者:Hatice G. Yayla、Huaiju Wang、Kyle T. Tarantino、Hudson S. Orbe、Robert R. Knowles
DOI:10.1021/jacs.6b06517
日期:2016.8.31
the redox-neutral isomerization of cyclic alcohols to linear ketones via C-C bond scission. Mechanistic studies demonstrate that key alkoxy radical intermediates in this reaction are generated via the direct homolytic activation of alcohol O-H bonds in an unusual intramolecular PCET process, wherein the electron travels to a proximal radical cation in concert with proton transfer to a weak Brønsted base
我们报告了一种新的光催化协议,用于通过 CC 键断裂将环醇氧化还原中性异构化为线性酮。机理研究表明,该反应中的关键烷氧基自由基中间体是通过在不寻常的分子内 PCET 过程中通过醇 OH 键的直接均裂活化而产生的,其中电子传播到邻近的自由基阳离子,同时质子转移到弱的布朗斯台德碱。显示有效的键强度考虑因素可以准确预测使用给定氧化剂/碱基对生成烷氧基自由基的可行性。