Synthesis and antimicrobial study of novel heterocyclic compounds from hydroxybenzophenones
作者:Shaukath A. Khanum、Sheena Shashikanth、S. Umesha、R. Kavitha
DOI:10.1016/j.ejmech.2005.04.005
日期:2005.11
The triazolothiadiazine analogues 6a-e were obtained via a multistep synthesis sequences beginning with the hydroxybenzophenones la-e. Hydroxybenzophenones on reaction with ethyl chloroacetate affords ethyl (2-aroylarytoxy)acetates 2a-e which on treatment with hydrazine hydrate yields 2-(2-aroylaryloxy)acetohydrazides 3a-e. Intramolecular cyclization of 3a-e with carbon disulfide affords 5-(2-aroylaryloxy)methyl-1,3,4-oxadiazole-2-(3H)thiones 4a-e, which on treatment with hydrazine hydrate yields 4-amino-5-(2-aroyl aryloxy)methyl-1,2,4-triazole-3-(2H)thiones 5a-e. Condensation of 5a-e with alpha-halocarbonyl compound results in 3-(2-aroylaryloxy)methyl-6-phenyl-1,2,4-triazolo[3,4-b][1,3,4] thiadiazine 6a-e analogues. The compounds 4a-e, 5a-e and 6a-e were tested against variety of fungal and bacterial strains in comparison to fluconazole and chloramphenicol, respectively. (c) 2005 Elsevier SAS. All rights reserved.