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Molecules 2012, 17(3), 3475-3483; doi:10.3390/molecules17033475

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

* , ,  and
Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
* Author to whom correspondence should be addressed.
Received: 13 January 2012 / Revised: 16 February 2012 / Accepted: 6 March 2012 / Published: 16 March 2012
(This article belongs to the Section Medicinal Chemistry)
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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.
Keywords: adamantane derivatives; 1,3,4-oxadiazoles; isoxazoles; antimicrobial activity adamantane derivatives; 1,3,4-oxadiazoles; isoxazoles; antimicrobial activity
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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El-Emam, A.A.; Alrashood, K.A.; Al-Omar, M.A.; Al-Tamimi, A.-M. 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 2012, 17, 3475-3483.

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