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。
Metal-free nitro-carbocyclization of activated alkenes: a direct approach to synthesize oxindoles by cascade C–N and C–C bond formation
作者:Tao Shen、Yizhi Yuan、Ning Jiao
DOI:10.1039/c3cc47336h
日期:——
A novel and direct metal-free nitro-carbocyclization of activatedalkenes leading to valuable nitro-containing oxindoles via cascade C-N and C-C bond formation has been developed. The mechanistic study indicates that the initial NO and NO2 radical addition and the following C-H functionalization processes are involved in this transformation.
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。