An acetic acid-promoted C(sp^(3))-H functionalization of 2-methyl quinoline,enaminoesters and elemental sulfur for the synthesis of 3,4,5-trisubstituted isothiazoles under metal-free conditions has been developed.This...An acetic acid-promoted C(sp^(3))-H functionalization of 2-methyl quinoline,enaminoesters and elemental sulfur for the synthesis of 3,4,5-trisubstituted isothiazoles under metal-free conditions has been developed.This approach provides viable access to various 5-(quinolin-2-yl)isothiazoles in moderate to good yields with good functional group tolerance.Moreover,the success of the gram-scale reaction gives this reaction a great potential application.展开更多
The palladium/copper-cocatalyzed oxidative C-H/C-H cross-coupling between two heteroarenes by using molecular oxygen as an oxidant instead of metal oxidants has been developed for the first time to construct biheteroa...The palladium/copper-cocatalyzed oxidative C-H/C-H cross-coupling between two heteroarenes by using molecular oxygen as an oxidant instead of metal oxidants has been developed for the first time to construct biheteroaryl motifs.A relatively broad range of thiophenes,furans and indoles can smoothly couple with various N-heteroarenes in satisfactory yields.This catalytic system with O2 as the terminal oxidant offers clear advantages of economically feasible and eco-friendly processes.展开更多
基金Support by the National Natural Science Foundation of China(Nos.22271244,21871226 and 21572194)Postgraduate Scientific Research Innovation Project of Hunan Province(No.CX20200631)the Open Research Fund of the School of Chemistry and Chemical Engineering of Henan Normal University(No.2022C02)is gratefully acknowledged.
文摘An acetic acid-promoted C(sp^(3))-H functionalization of 2-methyl quinoline,enaminoesters and elemental sulfur for the synthesis of 3,4,5-trisubstituted isothiazoles under metal-free conditions has been developed.This approach provides viable access to various 5-(quinolin-2-yl)isothiazoles in moderate to good yields with good functional group tolerance.Moreover,the success of the gram-scale reaction gives this reaction a great potential application.
基金supported by the National Basic Research Program of China(2011CB808601)the National Natural Science Foundation of China(21432005,21372164,21172155,21272160,21321061,J1103315)Sichuan Provincial Foundation(2012JQ0002)
文摘The palladium/copper-cocatalyzed oxidative C-H/C-H cross-coupling between two heteroarenes by using molecular oxygen as an oxidant instead of metal oxidants has been developed for the first time to construct biheteroaryl motifs.A relatively broad range of thiophenes,furans and indoles can smoothly couple with various N-heteroarenes in satisfactory yields.This catalytic system with O2 as the terminal oxidant offers clear advantages of economically feasible and eco-friendly processes.
