Mild and Efficient Ir(III)-Catalyzed Direct C–H Alkynylation of N-Phenoxyacetamides with Terminal Alkyne
摘要:
Ir(III)-catalyzed direct C-H alkynylation of arenes has been developed using commercially available TIPS-acetylene as an efficient alkynylating reagent, where O-NHAc was employed as an autocleavable oxidizing-directing group (ODG(auto)), thus giving rise to ortho-alkynylated phenols under mild reaction conditions in a highly efficient and redox-neutral manner. The reaction proceeded with high regioselectivity and broad substrate/functional group (FG) tolerance. The synthetic application of the products has been briefly exemplified. Preliminary mechanistic studies have been conducted, and a five-membered iridacycle has also been identified as a key intermediate.
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)。
Rhodium(<scp>iii</scp>)-catalyzed C–H activation/[4+3] annulation of N-phenoxyacetamides and α,β-unsaturated aldehydes: an efficient route to 1,2-oxazepines at room temperature
Rhodium-catalyzed C–H bond functionalization led to a [4+3] annulation strategy to access 1,2-oxazepine rings.
铑催化的C-H键官能化引发了一种[4+3]环化策略,以获得1,2-噁唑环。
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.