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。
To expand the toolbox for the synthesis of ortho-phenolic sulfilimines, sigmatropic rearrangements were introduced to the field of sulfiliminechemistry. Herein we report a N-H sulfenylation/[2,3]-sigmatropic rearrangement cascade reaction. This mild reaction enables commercially available thiols to serve as the sulfenylation reagent and generates water as the sole byproduct. Moreover, the reaction
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(III)-Catalyzed C–H Olefination for the Synthesis of <i>ortho</i>-Alkenyl Phenols Using an Oxidizing Directing Group
作者:Yangyang Shen、Guixia Liu、Zhi Zhou、Xiyan Lu
DOI:10.1021/ol4014188
日期:2013.7.5
By using an oxidizing directinggroup, a mild, efficient Rh(III) catalyzed C–H olefination reaction between N-phenoxyacetamides and alkenes was developed. This reaction provided a straightforward way for the synthesis of ortho-alkenyl phenols, and the directinggroup is traceless in the product.
Rh(III)-Catalyzed C–H Activation/[3 + 2] Annulation of <i>N</i>-Phenoxyacetamides via Carbooxygenation of 1,3-Dienes
作者:Liexin Wu、Liping Li、Haiman Zhang、Hui Gao、Zhi Zhou、Wei Yi
DOI:10.1021/acs.orglett.1c00945
日期:2021.5.21
C–H activation/[3 + 2] annulation of N-phenoxyacetamides has been developed for the construction of dihydrobenzofurans via carbooxygenation of 1,3-dienes. This transformation features a redox-neutral process with specific chemoselectivity, good substrate/functional group compatibility, and profound synthetic potentials. A preliminary exploration to realize their asymmetricsynthesis have been also successfully
Rhodium(III)-Catalyzed Redox-Neutral C–H Activation/Annulation of <i>N</i>-Aryloxyacetamides with Alkynyloxiranes: Synthesis of Highly Functionalized 2,3-Dihydrobenzofurans
作者:Yang Li、Dandan Shi、Yuhai Tang、Xin He、Silong Xu
DOI:10.1021/acs.joc.8b01166
日期:2018.8.17
Alkynyloxiranes have been employed for the first time as effective coupling partners in Cp*RhIII-catalyzed C–H functionalization reactions. Their annulation with N-aryloxyamides then offers a redox-neutral and efficient synthesis of functionalized 2,3-dihydrobenzofurans bearing an exocyclic E-allylic alcohol and a tetrasubstituted carbon center in good yields with a broad substrate scope. The products