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.
Rhodium(III)-Catalyzed Redox-Neutral Cascade [3 + 2] Annulation of <i>N</i>-Phenoxyacetamides with Propiolates via C–H Functionalization/Isomerization/Lactonization
A Rh(III)-catalyzed cascade [3 + 2] annulation of N-phenoxyacetamides with propiolates under mild conditions using the internal oxidative O–N bond as the directing group has been achieved. This catalytic system provides a regio- and stereoselective access to benzofuran-2(3H)-ones bearing exocyclic enamino motifs with exclusive Z configuration selectivity, acceptable to good yields and good functional
Hexafluoroisopropanol (HFIP)-prompted rearrangement of N-phenoxysulfonamides for the direct assembly of ortho-sulfonamide phenols: A combined experimental and computational study
作者:Yi Wang、Xiaoli Chen、Shuang Lin、Hui Gao、Fu-Xiaomin Liu、Zhi Zhou、Wei Yi
DOI:10.1016/j.tetlet.2021.153601
日期:2022.1
chemistry. Herein an efficient metal-free rearrangement reaction has been developed for the construction of ortho-sulfonamide phenols via HFIP-prompted intramolecularsulfonamide group 1,3-migration. This protocol features mild reaction conditions, broad functional group compatibility and good regioselectivity. Combined experimental mechanistic study and detailed DFT calculations clarified the crucial
Dual Directing-Groups-Assisted Redox-Neutral Annulation and Ring Opening of <i>N</i>-Aryloxyacetamides with 1-Alkynylcyclobutanols via Rhodium(III)-Catalyzed C–H/C–C Activations
A cascade [3 + 2] annulation and ringopening of N-aryloxyacetamides with 1-alkynylcyclobutanols via Rh(III)-catalyzed redox-neutral C–H/C–C activations using internal oxidative O–NHAc and −OH as the dual directing groups has been achieved. This reaction provided an efficient and regioselective approach to benzofuran derivatives with good functional group compatibility and high yields.
A Cp*RhIII‐catalyzed annulative carbooxygenation of challenging 1,1‐disubstituted alkenes triggered by C−Hactivation of N‐aryloxyacetamides has been established, which affords 2,3‐dihydrobenzofuran derivatives with a quaternary carbon center in good to excellent yields under mild redox‐neutral conditions. An amide group on the alkenes is essential for the process, and may inhibit the β‐H elimination
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。