Asymmetric Organocatalytic Epoxidation of α,β-Unsaturated Aldehydes with Hydrogen Peroxide
作者:Mauro Marigo、Johan Franzén、Thomas B. Poulsen、Wei Zhuang、Karl Anker Jørgensen
DOI:10.1021/ja051808s
日期:2005.5.1
The first asymmetricorganocatalytic epoxidation of α,β-unsaturatedaldehydes is presented. A chiral bisaryl−silyl-protected pyrrolidine acts as a very selective epoxidation organocatalyst using simple oxidation agents, such as hydrogen peroxide and tert-butyl hydroperoxide. The asymmetric epoxidation reactions proceed under environmental friendly reaction condition in, for example, water mixtures
介绍了 α,β-不饱和醛的第一个不对称有机催化环氧化反应。手性双芳基-甲硅烷基保护的吡咯烷使用简单的氧化剂(如过氧化氢和叔丁基过氧化氢)作为一种非常有选择性的环氧化有机催化剂。不对称环氧化反应在环境友好的反应条件下进行,例如,在醇的水混合物中,反应的范围通过以高产率和对映选择性 > 94% ee 形成光学活性的 α,β-环氧醛来证明。此外,还介绍了通过柠檬醛的不对称环氧化从螨虫直接合成性信息素。
Highly efficient asymmetric synthesis of α,β-epoxy esters via one-pot organocatalytic epoxidation and oxidative esterification
作者:Yi-ning Xuan、Han-Sen Lin、Ming Yan
DOI:10.1039/c3ob00056g
日期:——
Highly enantioselective synthesis of α,β-epoxy esters was achieved via one-pot organocatalytic epoxidation and consequent oxidative esterification. Excellent enantioselectivities (up to 99% ee) and good yields were obtained for a variety of α,β-epoxy esters. The method was readily scaled. Furthermore the product was applied towards the synthesis of (−)-clausenamide with excellent enantioselectivities
Green asymmetric synthesis of epoxypeptidomimetics and evaluation as human cathepsin K inhibitors
作者:Taynara L. Silva、Deborah A. dos Santos、Hugo C.R. de Jesus、Dieter Brömme、João B. Fernandes、Marcio W. Paixão、Arlene G. Corrêa、Paulo C. Vieira
DOI:10.1016/j.bmc.2020.115597
日期:2020.8
Cathepsin K (CatK) is a cysteine protease known for its potent collagenolytic activity, being recognized as an important target to the development of therapies for the treatment of bone disorders. Epoxypeptidomimetics have been reported as potent inhibitors of cathepsins, thus in this work we present a green synthesis of new peptidomimetics by using a one-pot asymmetric epoxidation/Ugi multicomponent
Enhancing the Peroxygenase Activity of a Cofactor‐Independent Peroxyzyme by Directed Evolution Enabling Gram‐Scale Epoxide Synthesis
作者:Marie‐Cathérine Sigmund、Guangcai Xu、Eleonora Grandi、Gerrit J. Poelarends
DOI:10.1002/chem.202201651
日期:2022.10.21
Directed evolution of the cofactor-independent peroxyzyme 4-OT yielded an efficient biocatalyst (fused 4-OT P8a) for the enantioselective epoxidation of α,β-unsaturatedaldehydes using hydrogen peroxide as an oxidant. The optimized peroxyzyme enabled the milligram- and gram-scale preparation of the desired α,β-epoxy-aldehydes with excellent conversions and outstanding enantiopurity, providing an attractive
Biocatalytic Cascade Synthesis of Enantioenriched Epoxides and Triols from Biomass‐Derived Synthons Driven by Specifically Designed Enzymes
作者:Eleonora Grandi、Michele Crotti、Marie-Cathérine Sigmund、Guangcai Xu、Pieter G. Tepper、Gerrit J. Poelarends
DOI:10.1002/chem.202300697
日期:——
application of multi-step enzymatic cascades to synthesize enantioenriched epoxides and vicinal aromatic triols from simple biomass-derived starting materials in one pot. These artificial metabolic pathways involve a tailor-made aldolase, a highly evolved cofactor-independent peroxyzyme, and when needed a specifically chosen epoxide hydrolase. These attractive biocatalyticcascades can be performed under environmentally