synthesis and antimicrobial activity of new 5-(2-thienyl)-1,2,4-triazoles and 5-(2-thienyl)-1,3,4-oxadiazoles and related derivatives合成及抗菌活性的新5 -(2-thienyl)1、2,4-triazoles和5 -(2-thienyl)1,3,则对和相关的衍生品.pdf

Molecules 2010, 15, 502-514; doi:10.3390/molecule OPEN ACCESS molecules ISSN 1420-3049 /journal/molecules Article Synthesis and Antimicrobial Activity of New 5-(2-Thienyl)-1,2,4- triazoles and 5-(2-Thienyl)-1,3,4-oxadiazoles and Related Derivatives Mohamed A. Al-Omar Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; E-Mail: malomar1@.sa Received: 14 December 2009; in revised form: 5 January 2010 / Accepted: 11 January 2010 / Published: 22 January 2010 Abstract: New 5-(2-thienyl)-1,2,4-triazoles and 5-(2-thienyl)-1,3,4-oxadiazoles namely, N- [3-mercapto-5-(2-thienyl)-1,2,4-triazol-4-yl]-N-arylthioureas 4a–e, 2-arylamino-5-(2- thienyl)-1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles 5a–e, 3-arylaminomethyl-5-(2-thienyl)- 1,3,4-oxadiazoline-2-thiones 7a–e, 3-(N-substituted anilinomethyl)-5-(2-thienyl)-1,3,4- oxadiazoline-2-thiones 8a, b and 3-(4-substituted-1-piperazinylmethyl)-5-(2-thienyl)-1,3,4- oxadiazoline-2-thiones 9a–f, were prepared. The synthesized compounds were tested for in vitro activities against certain strains of Gram-positive and Gram-negative bacteria and the yeast-like pathogenic fungus Candida albicans. Compound 9a displayed marked broad spectrum antibacterial activity, while compounds 4d, 5e, 7b, 7c, 7d, 9b, 9c and 9d were highly active against the tested Gram-positive bacteria. None of the synthesized compounds were proved to be significantly active against Candida