已经建立了Cp * Rh III催化的N-芳氧基乙酰胺的CH活化触发的具有挑战性的1,1-二取代烯烃的环状碳氧加合反应,该化合物可以在良好的收率下,以良好的收率提供具有季碳中心的2,3-二氢苯并呋喃衍生物。轻度氧化还原中性条件。烯烃上的酰胺基对于该过程至关重要,并且可能通过配位使铑中心饱和而抑制C(sp3-)-Rh物种中β-H的消除。此外,从控制实验中获得的机械学见解表明,涉及一种Rh III -Rh V -Rh III催化循环的机理。
Rhodium(III)-Catalyzed Redox-Neutral Coupling of<i>N</i>-Phenoxyacetamides and Alkynes with Tunable Selectivity
作者:Guixia Liu、Yangyang Shen、Zhi Zhou、Xiyan Lu
DOI:10.1002/anie.201300881
日期:2013.6.3
Give it a tweak: A novel oxidizing directing group was developed for a rhodium(III)‐catalyzed CH functionalization of N‐phenoxyacetamides with alkynes. A small change in the reaction conditions leads to either ortho‐hydroxyphenyl‐substituted enamides or cyclization to deliver benzofurans with high selectivity (see scheme; Cp*=C5Me5).
给它一个调整:一种新颖的氧化定向基团被用于铑(III)催化的开发Ç h的官能Ñ与炔-phenoxyacetamides。反应条件的微小变化会导致邻-羟苯基取代的酰胺或环化反应以高选择性提供苯并呋喃(参见方案; Cp * = C 5 Me 5)。
Synthesis of Polyaryl-Substituted Olefins via a Rh(III)-Catalyzed One-Pot Reaction Using <i>N</i>-Phenoxyacetamides, Ketones, and Hydrazines
A Rh(III)-catalyzed one-pot reaction of N-phenoxyacetamides, ketones, and hydrazines for a facile access to disubstituted and trisubstituted ethylenes is reported. In this method, various ketones are transformed into donor–donor diazo compounds, which engage in insertion with N-phenoxyacetamides, following β-H elimination under Rh(III) catalysis to generate (E)-polyaryl-substituted olefins. This chemistry
Construction of Benzofuran-3(2<i>H</i>)-one Scaffolds with a Quaternary Center via Rh/Co Relay Catalyzed C–H Functionalization/Annulation of <i>N</i>-Aryloxyacetamides and Propiolic Acids
作者:Wen-Kui Yuan、Ming-Hui Zhu、Rui-Sen Geng、Guang-Yi Ren、Lin-Bao Zhang、Li-Rong Wen、Ming Li
DOI:10.1021/acs.orglett.9b00181
日期:2019.3.15
An unprecedented synthesis of valuable benzofuran-3(2H)-one scaffolds with a quaternary center was developed via Rh/Co relay catalyzed C–H functionalization/annulation of N-aryloxyacetamides with propiolic acids in moderate to good yields. The reaction features the simultaneous construction of the benzofuran motif containing a C2 quaternary center and a C3 carbonyl group. The preliminary mechanism
Rhodium(III)-Catalyzed<i>ortho</i>Alkenylation of<i>N</i>-Phenoxyacetamides with<i>N</i>-Tosylhydrazones or Diazoesters through CH Activation
作者:Fangdong Hu、Ying Xia、Fei Ye、Zhenxing Liu、Chen Ma、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201309650
日期:2014.1.27
A coupling reaction of N‐phenoxyacetamides with N‐tosylhydrazones or diazoestersthrough RhIII‐catalyzed CHactivation is reported. In this reaction, ortho‐alkenyl phenols were obtained in good yields and with excellent regio‐ and stereoselectivity. Rh–carbene migratory insertion is proposed as the key step in the reaction mechanism.
cobalt(III)-catalyzed, redox-neutral, intermolecular carboamination of propiolates and bicyclic alkenes was developed. This non-annulative coupling strategy features atom economy, high regioselectivity, good yields, and functional groups tolerance. Such a carboamination reaction was applied to modified phenolsfrom the corresponding phenols under mild conditions.