Visible-Light-Induced Photocatalytic Aerobic Oxidative C<sub>sp3</sub>–H Functionalization of Glycine Derivatives: Synthesis of Substituted Quinolines
作者:Xiaorong Yang、Liqi Li、Ying Li、Yuan Zhang
DOI:10.1021/acs.joc.6b02683
日期:2016.12.16
with unactivated alkenes has been accomplished. This visible light-driven protocol has been successfully applied to a broad scope of glycine esters and simple alkenes, giving rise to diverse substitutedquinoline derivatives in 18–84% yield under mild (at room temperature under air atmosphere) and operationally simple reaction conditions.
Visible-light-enabled aerobic oxidative C<sub>sp3</sub>–H functionalization of glycine derivatives using an organic photocatalyst: access to substituted quinoline-2-carboxylates
A practical visible-light-induced aerobic oxidative dehydrogenative coupling reaction of glycine derivatives with olefins has been developed to efficiently synthesize quinoline-2-carboxylates. This metal-free process proceeds smoothly under mild conditions and exhibits good tolerance of functional groups. Given the low cost of the catalyst and feedstock materials, the mild reaction conditions and the
Catalytic Radical Cation Salt Induced C<sub>sp<sup>3</sup></sub>–H Functionalization of Glycine Derivatives: Synthesis of Substituted Quinolines
作者:Xiaodong Jia、Fangfang Peng、Chang Qing、Congde Huo、Xicun Wang
DOI:10.1021/ol301909g
日期:2012.8.3
A domino C-sp3-H functionalization of glycine derivatives was achieved under catalytic radical cation salt induced conditions, producing a series of quinolines. The proposed mechanism shows that a peroxyl radical cation, which is generated by the coupling between O-2 and TBPA(+center dot), might be involved to initiate the catalytic oxidation.
A Stable Zn-MOF for Photocatalytic C<sub>sp<sup>3</sup></sub>–H Oxidation: Vinyl Double Bonds Boosting Electron Transfer and Enhanced Oxygen Activation
reaction of glycine esters and styrenes. In comparison to a similar triphenylamine MOF (Zn-TCA), DFT calculations and extensive control experiments reveal that the introduction of functional vinyl doublebonds not only optimizes the visible-light absorption and photoredox potential of triphenylamine ligand to powerfully activate O2 via a single-electron-transfer process but also improves the conjugation
由于 O 2的动力学持久性或自旋禁止性质,分子氧活化一直是非均相光催化有氧氧化中的一个难题和挑战。在这项工作中,基于乙烯基官能化三苯胺和联吡啶配体的高度离域互穿 3D MOF 光催化剂Zn-TACPA ( H 3 TACPA = tris(3-carboxybiphenyl)amine) 已被制造并用作活性氧物种(ROS)发生器催化甘氨酸酯和苯乙烯的光氧化CDC /芳构化串联反应。与类似的三苯胺 MOF(Zn-TCA),DFT计算和广泛的控制实验表明,功能性乙烯基双键的引入不仅优化了三苯胺配体的可见光吸收和光氧化还原电位,通过单电子转移过程有效地激活O 2 ,而且提高了共轭度、载流子分离和 MOF 半导体的迁移效率,用于快速 O 2活化。这种氧活化能力使Zn-TACPA的催化产率高达 91%,是Zn-TCA的 2.6 倍. 此外,还通过一系列实验(包括 ESI-MS、ESR、IR 和荧