Rhodium(III)-Catalyzed Annulative Carbooxygenation of 1,1-Disubstituted Alkenes Triggered by C−H Activation
作者:Yang Li、Yuhai Tang、Xin He、Dandan Shi、Jun Wu、Silong Xu
DOI:10.1002/chem.201701703
日期:2017.6.1
A Cp*RhIII‐catalyzed annulative carbooxygenation of challenging 1,1‐disubstituted alkenes triggered by C−H activation 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。