Synthesis and antimicrobial activity of N'-heteroarylidene-1- adamantylcarbohydrazides and (±)-2-(1-adamantyl)-4-acetyl-5-[5-(4- substituted phenyl-3-isoxazolyl)]-1,3,4-oxadiazolines

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Abstract

The reaction of adamantane-1-carbohydrazide (1) with heterocyclic aldehydes, namely 5-(4-chlorophenyl)isoxazole-3-carboxaldehyde (2a), 5-(4-methylphenyl)isoxazole-3-carboxaldehyde (2b), 5-(4-methoxyphenyl)isoxazole- 3-carboxaldehyde (2c), 1H-imidazole-2-carboxaldehyde and 2-butyl-4-chloro-1H- imidazole-5-carboxaldehyde, in ethanol, yielded the corresponding N'-heteroarylidene-1-adamantylcarbohydrazides 3a, 3b, 3c, 4 and 5, respectively, in good yields. The 4-acetyl-1,3,4-oxadiazoline analogues 6a-c were prepared in 48-55% yields by heating their corresponding N'-heteroarylidene-1- adamantylcarbohydrazides 3a-c with acetic anhydride for two hours. Compounds 3a-c, 4, 5 and 6a-c were tested for in vitro activities against a panel of Gram-positive and Gram-negative bacteria and the yeast-like pathogenic fungus Candida albicans. Compounds 4 and 5 displayed potent broad-spectrum antimicrobial activity, while compounds 3a-c showed good activity against the Gram-positive bacteria. © 2012 by the authors.

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El-Emam, A. A., Alrashood, K. A., Al-Omar, M. A., & Al-Tamimi, A. M. S. (2012). Synthesis and antimicrobial activity of N’-heteroarylidene-1- adamantylcarbohydrazides and (±)-2-(1-adamantyl)-4-acetyl-5-[5-(4- substituted phenyl-3-isoxazolyl)]-1,3,4-oxadiazolines. Molecules, 17(3), 3475–3483. https://doi.org/10.3390/molecules17033475

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