Copper(II)-Catalyzed Aerobic Oxidative Synthesis of Substituted 1,2,3- and 1,2,4-Triazoles from Bisarylhydrazones via C–H Functionalization/C–C/N–N/C–N Bonds Formation
摘要:
An unprecedented copper(II)-catalyzed aerobic oxidative synthesis of 2,4,5-triary1-1,2,3-triazoles and 1,3,5-triaryl-1,2,4-triazoles from bisarylhydrazones as the common starting precursor has been achieved via cascade C-H functionalization/C-C/N-N/C-N bonds formation under mild reaction conditions. One of the enthralling outcomes of this strategy is the copper(II)-catalyzed room temperature C-H functionalization/C-N bond formation in presence of air, which has been accomplished during the synthesis of substituted 1,2,4-triazoles. This new class of compounds could give prospective luminescence as an iconic component in the area of pharmaceutical and biological sciences. The intermediates for both the processes have been isolated to elucidate the mechanistic scenario.
1,2,3- and 1,2,4-triazolium salts, pyrazoles, and quinoxalines from diarylnitrilimines and isocyanides: A study of the scope
作者:Dietrich Moderhack、Ali Daoud
DOI:10.1002/jhet.5570400411
日期:2003.7
4-triazolium salts 11 are formed. Compounds 11 with tert-butyl group at the ring are unstable too, giving rise to triazoles 13. Pyrazoleformation (analogues of 14) is completely suppressed when both tert-butyl and aryl isocyanides are used, whereas access to this ring system works best with see-alkyl isocyanides (the influence of substituents of 2 being almost negligible in this case). Formation of quinoxalines
A practical base mediated synthesis of 1,2,4-triazoles enabled by a deamination annulation strategy
作者:Chunyan Zhang、Zuyu Liang、Xiaofei Jia、Maorong Wang、Guoying Zhang、Mao-Lin Hu
DOI:10.1039/d0cc05828a
日期:——
A rapid and efficient base mediated synthesis of 1,3,5-trisubstituted 1,2,4-triazoles has been developed from annulation of nitriles with hydrazines, which can be scaled up to a wide range of triazoles in good to excellent yields. Ammonia gas is liberated during the reaction, and halo, hetero functional groups as well as free hydroxyl, amino are tolerated in this transformation. A variety of alkyl