α-MsO/TsO/Cl Ketones as Oxidized Alkyne Equivalents: Redox-Neutral Rhodium(III)-Catalyzed CH Activation for the Synthesis of N-Heterocycles
作者:Da-Gang Yu、Francisco de Azambuja、Frank Glorius
DOI:10.1002/anie.201310272
日期:2014.3.3
α‐Halo and pseudohalo ketones are used for the first time as C(sp3)‐based electrophiles in transition‐metal‐catalyzed CHactivation and as oxidizedalkyneequivalents in RhIII‐catalyzed redox‐neutral annulations to generate diverse N‐heterocycles. This transformation is efficient and scalable. Due to the mild reaction conditions, a variety of functional groups could be tolerated.
A water-mediated C–H activation using sulfoxonium ylides is reported, providing a general, green and step-economic approach to construct a C–C bond and varieties of useful N-heterocycle scaffolds. Notably, the “water-mediated” activation, in contrast to that in organic solvents, shows great potential in pharmaceutical, biochemistry and chemical industries.
Iridium(III)-Catalyzed C–H Cyclization of Sulfoximines with Diazo Meldrum’s Acids for the Synthesis of Cyclic Sulfoximines
作者:Gi Uk Han、Suhui Kim、Sang Hoon Han、Chanyoung Maeng、Gi Hoon Ko、Kyungsup Lee、Hee Chan Noh、Phil Ho Lee
DOI:10.1021/acs.joc.3c00984
日期:2023.8.18
Iridium(III)-catalyzedC–H cyclization of sulfoximines with diazo Meldrum’s acid provided cyclic sulfoximines with a carbonyl group in good to excellent yields. These compounds were easily converted into unsubstituted and arylated sulfoximines. Moreover, the vinyl triflates obtained from the cyclic sulfoximines underwent palladium(II)-catalyzed cross-coupling reactions with a variety of aryl, arylalkynyl