Unexpected result for the acylation of arylhydrazonoethanethioamides
摘要:
The acylation of arylhydrazonoethanethioamides containing primary amino group did not yield acylthioamides as expected. Surprisingly, the cyclic 5-acylimino-2,5-dihydro-1,2,3-thiadiazoles were obtained. The formation of thiadiazoles in this reaction was explained by the higher ability of arylhydrazono-N-acylthioacetamide intermediates to be oxidized comparing to their precursors. The presence of pseudobicyclic aromatic structure in the reaction product was a main factor favoring the formation of 1,2,3-thiadiazole ring. (C) 2013 Elsevier Ltd. All rights reserved.
Unexpected result for the acylation of arylhydrazonoethanethioamides
作者:Anastasiya I. Bolgova、Kseniya I. Lugovik、Julia O. Subbotina、Pavel A. Slepukhin、Vasiliy A. Bakulev、Nataliya P. Belskaya
DOI:10.1016/j.tet.2013.06.071
日期:2013.9
The acylation of arylhydrazonoethanethioamides containing primary amino group did not yield acylthioamides as expected. Surprisingly, the cyclic 5-acylimino-2,5-dihydro-1,2,3-thiadiazoles were obtained. The formation of thiadiazoles in this reaction was explained by the higher ability of arylhydrazono-N-acylthioacetamide intermediates to be oxidized comparing to their precursors. The presence of pseudobicyclic aromatic structure in the reaction product was a main factor favoring the formation of 1,2,3-thiadiazole ring. (C) 2013 Elsevier Ltd. All rights reserved.