Novel Process for Synthesis of 1,2,4‐Triazoles: Ytterbium Triflate–Catalyzed Cyclization of Hydrazonyl Chlorides with Nitriles
摘要:
A series of 1,3,5-trisubstituted 1,2,4-triazoles were synthesized via the intermolecular cyclization of hydrazonyl chlorides with nitriles catalyzed by ytterbium triflate [Yb(OTf)(3)]. The amount of catalysis was discussed and Yb(OTf)(3) could be reused without loss of activity.
1,3-dipolar cycloadditions induced by cation radicals. Formation of 1,2,4-triazoles from oxidative addition of 1,4-diphenylazomethane and aryl aldehyde phenylhydrazones to nitriles
作者:A.K.M.Mansurul Hoque、Albert C. Kovelesky、Lee Wang-Keun、Henry J. Shine
DOI:10.1016/s0040-4039(01)80911-4
日期:1985.1
Reaction of thianthrenecationradicalperchlorate (Th.+ClO4−) with 1,4-diphenylazomethane (DPAM) in MeCN and EtCN led to the formation of 1,2,4-triazoles. Triazoles formation is attributed to oxidative cycloaddition of benzaldehyde benzylhydrazone, the tautomer of DPAM, to the solvent nitriles. In confirmation, analogous cycloadditions were achieved by reaction of Th.+ClO4− with some benzaldehyde
Electrochemical Cyclization of Hydrazones and Amidines To Access Trisubstituted 1,2,4-Triazoles
作者:Dong Tang、Rui Jiang、Yangxiu Mu、Jing Hou、Yaya Wan、Yu Hong、Zhixiang Yang
DOI:10.1055/a-2082-0918
日期:2023.9
A KI-mediated electrochemical method has been developed for the synthesis of trisubstituted 1,2,4-triazoles from easily accessible hydrazones and amidines derivatives. The protocol provides various aryl and alkyl 1,2,4-triazoles in moderate to good yields with good functional-group tolerance and without the need for any chemical oxidants in an undivided cell.
开发了一种 KI 介导的电化学方法,用于从易于获得的腙和脒衍生物合成三取代的 1,2,4-三唑。该协议提供各种芳基和烷基 1,2,4-三唑,产量适中,具有良好的官能团耐受性,并且在未分裂的细胞中不需要任何化学氧化剂。
HOQUE, A. K. M. M.;KOVELESKY, A. C.;LEE, WANG-KEUN;SHINE, H. J., TETRAHEDRON LETT., 1985, 26, N 46, 5655-5658
作者:HOQUE, A. K. M. M.、KOVELESKY, A. C.、LEE, WANG-KEUN、SHINE, H. J.