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
Iodine(V) Reagents in Organic Synthesis. Part 3. New Routes to Heterocyclic Compounds via <i>o</i>-Iodoxybenzoic Acid-Mediated Cyclizations: Generality, Scope, and Mechanism
作者:K. C. Nicolaou、P. S. Baran、Y.-L. Zhong、S. Barluenga、K. W. Hunt、R. Kranich、J. A. Vega
DOI:10.1021/ja012126h
日期:2002.3.1
The discovery and development of the o-iodoxybenzoic acid (IBX) reaction with certain unsaturated N-aryl amides (anilides) to form heterocycles are described. The application of the method to the synthesis of delta-lactams, cyclic urethanes, hydroxy amines, and amino sugars among other important building blocks and intermediates is detailed. In addition to the generality and scope of this cyclization
Dihydropyranone Formation by <i>Ipso</i> C−H Activation in a Glucal 3-Carbamate-Derived Rhodium Acyl Nitrenoid
作者:Brisa Hurlocker、Nadia C. Abascal、Lindsay M. Repka、Elsy Santizo-Deleon、Abigail L. Smenton、Victoria Baranov、Ritu Gupta、Sarah E. Bernard、Shenjuti Chowdhury、Christian M. Rojas
DOI:10.1021/jo101599q
日期:2011.4.1
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.