Carbonylative Synthesis of Phthalimides and Benzoxazinones by Using Phenyl Formate as a Carbon Monoxide Source
作者:Sujit P. Chavan、Bhalchandra M. Bhanage
DOI:10.1002/ejoc.201500109
日期:2015.4
efficient palladium-catalyzed carbonylative cyclization of N-substituted 2-iodobenzamides and 2-iodoanilides was investigated for the synthesis of phthalimides and benzoxazinones, respectively, by usingphenylformate as a CO source. The present catalytic protocol circumvents the use of an expensive phosphine ligand as well as solvent in the case of the phthalimidesynthesis. Moreover, mild reaction conditions
通过使用甲酸苯酯作为 CO 源,研究了一种简单有效的钯催化的 N-取代 2-碘苯甲酰胺和 2-碘苯胺的羰基化环化反应,分别用于合成邻苯二甲酰亚胺和苯并嗪酮。本催化协议在邻苯二甲酰亚胺合成的情况下避免使用昂贵的膦配体以及溶剂。此外,温和的反应条件和对各种官能团的耐受性增强了该方法的普遍适用性。
Rhodium-Catalyzed Formal C–O Insertion in Carbene/Alkyne Metathesis Reactions: Synthesis of 3-Substituted 3<i>H</i>-Indol-3-ols
作者:Shikun Jia、Guizhi Dong、Chaoqun Ao、Xianxing Jiang、Wenhao Hu
DOI:10.1021/acs.orglett.9b01492
日期:2019.6.7
An efficient and novel rhodium-catalyzed formal C–O insertion reaction of alkyne-tethered diazo compounds for the synthesis of 3H-indol-3-ols is described. A type of donor/donor rhodium carbene generated in situ via a carbene/alkyne metathesis (CAM) process is the key intermediate and terminates in a unique transformation different from donor/acceptor carbenoids. In addition, 18O-labeling experiments
An efficient heterogeneous copper-catalyzed cyclization of o-haloanilides and metalsulfides has been achieved via the C–S coupling in DMF at 80 or 140 °C in the existence of an MCM-41-bound NHC-Cu(I) catalyst and then intramolecular condensation, delivering a wide range of substitutedbenzothiazoles in mostly good to high yields. This new MCM-41-NHC-CuI complex can facilely be obtained by a two-step
Hydroarylation of Arenes via Reductive Radical-Polar Crossover
作者:Autumn R. Flynn、Kelly A. McDaniel、Meredith E. Hughes、David B. Vogt、Nathan T. Jui
DOI:10.1021/jacs.0c03926
日期:2020.5.20
photocatalytic system for the dearomative hydroarylation of benzenederivatives has been developed. Using a combination of an organic photoredox catalyst and an amine reductant, this process operates through a reductive radical-polar crossover mechanism where aryl halide reduction triggers a regioselective radical cyclization event, followed by anion formation and quenching to produce a range of complex spirocyclic
Efficient Cu-catalyzed intramolecular <i>O</i>-arylation for synthesis of benzoxazoles in water
作者:Yanling Tang、Minxin Li、Hui Gao、Gaoxiong Rao、Zewei Mao
DOI:10.1039/d0ra00570c
日期:——
An efficient method was developed for synthesis of benzoxazoles by Cu-catalyzed intramolecular O-arylation of o-halobenzanilides in water. This strategy provides several advantages, such as high yields, water as a green solvent and functional groups tolerance.