Oxidative alkoxycarbonylation of terminal alkenes with carbazates
作者:Yu-Han Su、Zhao Wu、Shi-Kai Tian
DOI:10.1039/c3cc42994f
日期:——
A range of terminal alkenes smoothly underwent palladium-catalyzed oxidative alkoxycarbonylation with carbazates under an oxygen atmosphere to afford structurally diverse α,β-unsaturated esters in moderate to good yields with excellent regioselectivity and E selectivity.
The Use of pH to Influence Regio- and Chemoselectivity in the Asymmetric Aminohydroxylation of Styrenes
作者:Vitaliy Nesterenko、Joshua T. Byers、Paul J. Hergenrother
DOI:10.1021/ol027242j
日期:2003.2.1
[reaction: see text] The pH-controlled Sharplessasymmetricaminohydroxylation (AA) of styrenes provides 1-aryl-2-amino ethanols (regioisomer B) with high enantio-, chemo-, and regioselectivity. As existing AA protocols typically give regioisomer A as the major reaction product when using carbamate nitrogen sources, this method is a convenient alternative for the selective production of regioisomer
Catalytic Intermolecular Dicarbofunctionalization of Styrenes with CO<sub>2</sub>
and Radical Precursors
作者:Veera Reddy Yatham、Yangyang Shen、Ruben Martin
DOI:10.1002/anie.201706263
日期:2017.8.28
A redox‐neutral intermolecular dicarbofunctionalization of styrenes with CO2 at atmospheric pressure and carbon‐centered radicals is described. This mild protocol results in multiple C−C bond‐forming reactions from simple precursors in the absence of stoichiometric reductants, thus exploiting a previously unrecognized opportunity that complements existing catalytic carboxylation events.
Generation of Stoichiometric Ethylene and Isotopic Derivatives and Application in Transition‐Metal‐Catalyzed Vinylation and Enyne Metathesis
作者:Geanna K. Min、Klaus Bjerglund、Søren Kramer、Thomas M. Gøgsig、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1002/chem.201303668
日期:2013.12.16
Ethylene is one of the most important buildingblocks in industry for the production of polymers and commodity chemicals. 13C‐ and D‐isotope‐labeled ethylenes are also valuable reagents with applications ranging from polymer‐structure determination, reaction‐mechanism elucidation to the preparation of more complex isotopically labeled compounds. However, these isotopic derivatives are expensive, and
Neutral-Eosin Y-Catalyzed Regioselective Hydroacylation of Aryl Alkenes under Visible-Light Irradiation
作者:Xinxin Tang、Jie Wu、Haiwang Liu、Fei Xue、Mu Wang
DOI:10.1055/a-1319-6237
日期:2021.3
The hydroacylation of styrene derivatives were achieved by employing neutral eosin Y as a direct hydrogen atom transfer (HAT) catalyst under visible-light irradiation. Exclusive anti-Markovnikov selectivity could be obtained. Aldehydes and styrenes with various substituents were tolerated (>20 examples) to achieve products with moderate to high yields. The key acyl radical intermediate was generated
通过在可见光照射下使用中性曙红 Y 作为直接氢原子转移 (HAT) 催化剂来实现苯乙烯衍生物的加氢酰化。可以获得独特的抗马尔科夫尼科夫选择性。可以容忍具有各种取代基的醛和苯乙烯(> 20 个例子)以实现中等至高产率的产品。关键的酰基自由基中间体由光激发的曙红 Y 诱导的直接 HAT 过程产生。随后加入苯乙烯和反向 HAT 过程产生酮产物。