An FeCl2-promoted carbomethylation of arylacrylamides by di-tert-butyl peroxide (DTBP) is achieved, leading to 3-ethyl-3-substituted indolin-2-one in high yield. The reaction tolerates a series of functional groups, such as cyano, nitro, ethyloxy carbonyl, bromo, chloro, and trifluoromethyl groups. The radical methylation and arylation of the alkenyl group are involved in this reaction.
A benzene-bridged divanadium complex-early transition metal catalyst for alkene alkylarylation with PhI(O<sub>2</sub>CR)<sub>2</sub><i>via</i> decarboxylation
作者:Lei Zhang、Hongfei Zhou、Shaokun Bai、Shaodan Li
DOI:10.1039/d0dt04295a
日期:——
alkene alkylarylation with hypervalent iodine(III) reagents (HIRs) via decarboxylation to generate regioselectively diverse indolinones. Furthermore, the mild nature of this reaction was amenable to a wide range of functionalities on alkenes and HIRs. Mechanistic studies revealed a relay sequence of decarboxylative radical alkylation/radical arylation/oxidative re-aromatization.
全面研究了苯桥二钒配合物的合成,结构和催化活性。通过以苯为溶剂用石墨烯酸钾(KC 8)还原由β-二酮化支持的(Nacnac)VCl 2(1)(Nacnac =(2,6- i Pr 2 C 6 H 3 NCMe)2 HC)访问苯桥连的倒夹心二钒配合物(μ-η 6:η 6 -C 6 H ^ 6)[V(Nacnac)] 2(图2a),它可催化与高价碘烯烃alkylarylation(III试剂(HIR)通过脱羧生成区域选择性多样的吲哚啉酮。此外,该反应的温和性质适合于烯烃和HIR的多种官能度。机理研究揭示了脱羧自由基烷基化/自由基芳基化/氧化再芳构化的中继序列。
Synthesis of Oxindoles through Silver-Catalyzed Trifluoromethylation-, Difluoromethylation- and Arylsulfonylation-Cyclization Reaction of<i>N</i>-Arylacrylamides
作者:Jidan Liu、Shaobo Zhuang、Qingwen Gui、Xiang Chen、Zhiyong Yang、Ze Tan
DOI:10.1002/ejoc.201400087
日期:2014.5
Efficient synthesis of trifluoromethyl and difluoromethyl-substituted oxindoles was achieved by reacting Langlois reagent or Baran reagent with N-arylacrylamides. However, the reaction of aryl sulfinic acid sodium salts with N-arylacrylamides did not give the desulfinative products, instead, aryl sulfonated products were produced.
通过 Langlois 试剂或 Baran 试剂与 N-芳基丙烯酰胺反应,实现了三氟甲基和二氟甲基取代的羟吲哚的有效合成。然而,芳基亚磺酸钠盐与N-芳基丙烯酰胺的反应没有得到脱亚磺化产物,而是产生了芳基磺化产物。
Bromo Radical‐Mediated Photoredox Aldehyde Decarbonylation towards Transition‐Metal‐Free Hydroalkylation of Acrylamides at Room Temperature
作者:Zhaozhao Sun、Huawen Huang、Qiaolin Wang、Guo‐Jun Deng
DOI:10.1002/adsc.202101188
日期:2022.1.18
Herein, we report a visible-light-mediated hydroalkylation reaction of alkenes using easily available aldehydes as alkyl sources via bromo radical-promoted photoredox decarbonylation. This protocol provides an alternative entry to C(sp3)−C(sp3) bond formation and features considerable advantages including mild and clean reaction conditions, obviation for transition-metal catalyst, and good functional
Catalyst-free and selective trifluoromethylative cyclization of acryloanilides using PhICF<sub>3</sub>Cl
作者:Jia Guo、Cong Xu、Ling Wang、Wanqiao Huang、Mang Wang
DOI:10.1039/c9ob00601j
日期:——
Trifluoromethylation-triggered cyclization of alkenes provides a useful route to CF3-containing cyclic compounds. Current approaches to generate CF3-based initiators from a CF3 source require a catalyst or an activator. This work describes a catalyst-free protocol to innately produce electrophilic CF3 species from PhICF3Cl for trifluoromethylative cyclization of acryloanilides. A new domino biscyclization of dienes