Recyclable Palladium-Catalyzed Carbonylative Cyclization of Aryl Iodides and 2-Hydroxyacetophenones towards Flavones
作者:Mingzhong Cai、Bin Huang、Gang Xie、Jianan Zhan
DOI:10.1055/s-0042-1753042
日期:2023.2
A highly efficient heterogeneous palladium-catalyzedcarbonylative cyclization of aryl iodides and 2-hydroxyacetophenones is developed. The reaction proceeds efficiently in DMSO at 120 °C under 3 bar of carbon monoxide by using 2 mol% of an MCM-41-immobilized bidentate phosphine palladium complex [MCM-41-2P-Pd(OAc)2] as the catalyst and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as the base, providing
Using the Thiyl Radical for Aliphatic Hydrogen‐Atom Transfer: Thiolation of Unactivated C−H Bonds
作者:Liubov I. Panferova、Mikhail O. Zubkov、Vladimir A. Kokorekin、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1002/anie.202011400
日期:2021.2.8
A metal‐ and catalyst‐free thiyl‐radical‐mediated activation of alkanes is described. Tetrafluoropyridinyl disulfide is used to perform thiolation of the C−H bonds under irradiation with 400 nm light‐emitting diodes. The key C−H activation step is believed to proceed via hydrogen‐atom abstraction effected by the fluorinated thiylradical. Secondary, tertiary, and heteroatom‐substituted C−H bonds can