A method for copper(II)-mediated N-N bond formation of N-imidoylisothioureas has been developed for the synthesis of 1,2,4-triazoles. The reaction requires cerium(IV) sulfate as an oxidant and proceeds at room temperature. This approach provides access to a variety of substituted 1,2,4-triazoles.
Copper-catalyzed synthesis of 3-substituted-5-amino-1,2,4-thiadiazoles via intramolecular N–S bond formation
作者:Ha-Young Kim、Se Hun Kwak、Gee-Hyung Lee、Young-Dae Gong
DOI:10.1016/j.tet.2014.09.023
日期:2014.11
A copper-catalyzed N-S bond formation was utilized to produce 3-substituted-5-amino-1,2,4-thiadiazoles from imidoyl thioureas obtained by reaction of amidine hydrochlorides with isothiocyanates. Moreover, the 1,2,4-thiadiazoles were generated through a one-pot protocol without the isolation of the intermediates. This new method is highly efficient and convenient because it employs the cheap and environmentally friendly copper salt and can be conducted under air. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis of 4-Substituted 2-Phenylaminothiazoles from Amidines. A Convenient Route to 4-Trichloromethylthiazoles
作者:Moisés Romero-Ortega、Adriana Aviles、Raymundo Cruz、Aydee Fuentes、Rosa María Gómez、Andrés Plata
DOI:10.1021/jo0009447
日期:2000.10.1
572. Thiadiazoles. Part VIII. 3-Alkyl(or aryl)-5-alkyl(or aryl)-amino-1,2,4-thiadiazoles