A series of different 1,3,5-trisubstituted 1,2,4-triazoles 9 have been readily prepared by simple oxidation of corresponding N-alkylamide arylhydrazones (amidrazones) 5 with hydrogen peroxide or potassium permanganate.
An Improved Synthesis of 1,2,4-Triazoles using Ag2CO3
作者:K Paulvannan、Tao Chen、Ron Hale
DOI:10.1016/s0040-4020(00)00726-2
日期:2000.10
An improved synthesis of 1,3,5-trisubstituted 1,2,4-triazoles via Ag2CO3 mediated cyclization of triazenes has been developed. This approach is flexible and compatible with a wide range of functional groups. The reaction was complete within 3 h and the products were isolated in moderate to high yields. The influence of the beta-substituents of the amines on the triazole formation was also studied. (C) 2000 Elsevier Science Ltd. All rights reserved.
Buzykin, B. I.; Bredikhina, Z. A.; Gazetdinova, N. G., Journal of general chemistry of the USSR, 1991, vol. 61, # 4.2., p. 939 - 940
作者:Buzykin, B. I.、Bredikhina, Z. A.、Gazetdinova, N. G.
DOI:——
日期:——
Cyclization of 1,2,4-triazenes to 1,2,4-triazoles using oxidizing reagents—NaClO, Ca(ClO)2, Dess–Martin periodinane and Ley's TPAP/NMO
作者:K Paulvannan、Ron Hale、Daniel Sedehi、Tao Chen
DOI:10.1016/s0040-4020(01)00976-0
日期:2001.11
A simple and efficient approach to 1,3,5-trisubstituted 1,2,4-triazoles via cyclization of 1,2,4-triazenes employing commonly used oxidizing agents such as NaClO, Ca(ClO)(2), Dess-Martin periodinane and Ley's oxidizing agent (TPAP/NMO) is described. The reaction proceeds under mild conditions and is compatible with various functional groups. Extension of this approach to prepare triazoles on solid support has also been investigated. (C) 2001 Elsevier Science Ltd. All rights reserved.
�ber die Synthese von Dihydro-1,2,3,5-thiatriazol-1,1-dioxiden, 2. Mitt.