Synthesis of 2-amino-5-aryl-1,3,4-thiadiazoles and their condensed analogs with the use of aromatic nitrites
作者:S. Sh. Shukurov、M. A. Kukaniev、B. M. Bobogaribov、S. S. Sabirov
DOI:10.1007/bf00707235
日期:1995.10
Aromatic nitrites are found to readily react with thiosemicarbazide and 4-amino-3-methyl-1,2,4-triazol-5-thione in a solution of polyphosphoric acid to give corresponding 2-amino-5-aryl-1,3,4-thiadiazoles.
Unprecedented conversion of (Z)-3-chloro-3-arylacrylic acids to benzoic acids: synthesis of s-triazolo[3,4-b][1,3,4]thiadiazoles
作者:Seema Sahi、Madhvi Bhardwaj、Satya Paul
DOI:10.1016/j.tetlet.2014.05.059
日期:2014.7
An unprecedented method for the conversion of (Z)-3-chloro-3-arylacrylic acids to corresponding benzoic acids by stirring in POCl3 at 80 degrees C is reported. The benzoic acids formed in situ undergo condensation with 4-amino-5-aryl-3-mercapto-1,2,4-triazoles to yield s-triazolo[3,4-b][1,3,4]thiadiazoles in high yields. (C) 2014 Elsevier Ltd. All rights reserved.