Organocatalyzed Domino [3+2] Cycloaddition/Payne-Type Rearrangement using Carbon Dioxide and Epoxy Alcohols
作者:Sergio Sopeña、Mariachiara Cozzolino、Cristina Maquilón、Eduardo C. Escudero-Adán、Marta Martínez Belmonte、Arjan W. Kleij
DOI:10.1002/anie.201803967
日期:2018.8.27
cyclic carbonate under thermodynamic control. The latter are conveniently trapped in situ, providing overall a new domino process for synthetically elusive heterocyclic scaffolds. Control experiments provide a rationale for the observed cascade reactions, which demonstrate similarity to the well‐known Payne rearrangement of epoxyalcohols.
Solvent-free epoxidation using a tungstic acid catalyst on fluoroapatite
作者:Junko Ichihara
DOI:10.1016/s0040-4039(00)02040-2
日期:2001.1
Tungstic acid dispersed on fluoroapatite solid phase (H2WO4/FAp) catalyzed the epoxidation of cycloalkenes and allylic alcohols with a solid urea-hydrogen peroxide complex (urea-H2O2) without a solvent. (C) 2001 Elsevier Science Ltd. All rights reserved.
Corrigendum: Substrate-Controlled Product Divergence: Conversion of CO<sub>2</sub>
into Heterocyclic Products
作者:Jeroen Rintjema、Roel Epping、Giulia Fiorani、Eddy Martín、Eduardo C. Escudero-Adán、Arjan W. Kleij
DOI:10.1002/anie.201603558
日期:2016.9.26
Substrate-Controlled Product Divergence: Conversion of CO<sub>2</sub>
into Heterocyclic Products
作者:Jeroen Rintjema、Roel Epping、Giulia Fiorani、Eddy Martín、Eduardo C. Escudero-Adán、Arjan W. Kleij
DOI:10.1002/anie.201511521
日期:2016.3.14
Substituted epoxy alcohols and amines allow substrate‐controlled conversion of CO2 into a wide range of heterocyclic structures through different mechanistic manifolds. This new approach results in an unusual scope of CO2‐derived products by initial activation of CO2 through either the amine or alcohol unit, thus providing nucleophiles for intramolecular epoxy ring opening under mild reaction conditions
取代的环氧醇和胺可通过不同的机械歧管,将底物控制的CO 2转化为多种杂环结构。这种新方法通过胺或醇单元对CO 2的初始活化,导致了源自CO 2衍生产品的异常范围,从而在温和的反应条件下为分子内环氧开环提供了亲核试剂。对照实验通过遵循S N i途径的亲核试剂开环步骤和5-exo-tet环化作用,支持了胺/醇片段在该过程中的关键作用,从而形成了杂环骨架。