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Synthesis and Biological Evaluation of Some Heterocyclic Compounds from Salicylic Acid Hydrazide[1][, ]
Author(s) -
Sarshira E. M.,
Hamada N. M.,
Moghazi Y. M.,
Abdelrahman M. M.
Publication year - 2016
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.2516
Subject(s) - chemistry , hydrazide , hydrazone , acetic anhydride , ethyl acetoacetate , acetic acid , pyridine , organic chemistry , sulfuric acid , ammonium thiocyanate , chloroacetic acid , formic acid , sodium hydroxide , medicinal chemistry , nuclear chemistry , catalysis
Different heterocyclic compounds were prepared starting from 2‐hydroxy benzohydrazide; for example, cyclization of hydrazide hydrazone 3 derived from 2‐hydroxybenzohydrazide 2 with acetic anhydride or concentrated sulfuric acid gave 1,3,4‐oxadiazole derivatives 4 – 5 . On the other hand, direct cyclization of 2‐hydroxy benzohydrazide 2 with one carbon cyclizing agent gave a new derivative of 1,3,4‐oxadiazole 7 , 8 , 9 , 10 , 11 . Heating of hydrazide hydrazone 3 with thioglycolic acid in pyridine gave thiazolidinone 12 . When 2‐hydroxy benzohydrazide 2 reacted with aliphatic carboxylic acids such as formic acid or acetic acid , it gave the corresponding N ‐formyl or N ‐acetyl derivatives 6 . Subsequent cyclization of 6 using phosphorous pentasulphide in pyridine gave 1,3,4‐thiadiazoles 13 . Cyclization of 2‐hydroxy benzohydrazide with ethyl acetoacetate gives pyrazolone derivative 14 . Finally, when an ethanolic solution of acid hydrazide 2 was treated with ammonium thiocyanate in 35% HCl, it gave the thiosemicarbazide 15 . Subsequent treatment of 15 with concentrated sulfuric acid or 10% sodium hydroxide gave 5‐amino‐1,3,4‐thiadiazole 16 and 1,2,4‐triazole 17 , respectively. The structures of all newly isolated compounds were confirmed using 1 H NMR, IR spectra, and elemental analyses. The antimicrobial activities for all isolated compounds were examined against different microorganisms.

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