Dihydropyranone Formation by Ipso C−H Activation in a Glucal 3-Carbamate-Derived Rhodium Acyl Nitrenoid
摘要:
By using (N-tosyloxy)-3-O-carbamoyl-o-glucal 10, which removes the :need for a hypervalentsiodine (III) oxidant, we provide evidence for rhodium nitrenoid-mediated ipso C-H activation as the origin of a C3oxidized dihydropyranone product 3. This system may be especially susceptible to such a pathway because of the ease of forming a cation upon hydride transfer to the rhodium-complexed acyl nitrene.
作者:Shuai Zheng、Shuo-Qing Zhang、Borna Saeednia、Jiawang Zhou、Jessica M. Anna、Xin Hong、Gary A. Molander
DOI:10.1039/d0sc01459a
日期:——
The selective 1,2-aminoacylation of olefins provides opportunities for the rapid construction of nitrogen-containing molecules. However, the lack of CO-free acylation reactions has limited their application. By using photoredox proton-coupled electron transfer (PCET)/Ni dual-catalysis, a highly regio- and diastereoselective amidoacylation of unactivated olefins has been developed. Various acyl electrophiles