Volume 50, Issue 2 pp. 216-219
Article

Synthesis and Fungicidal Activity of 5-Aryl-1-(aryloxyacetyl)-3-(tert-butyl or phenyl)-4-(1H-1,2,4-triazol-1-yl)-4,5-dihydropyrazole

Hui-Yu Mao

Hui-Yu Mao

Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China

Wuhan Bioengineering Institute, Yangluo District, Wuhan 430415, People's Republic of China

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Hong Song

Hong Song

Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China

Wuhan Bioengineering Institute, Yangluo District, Wuhan 430415, People's Republic of China

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De-Qing Shi

Corresponding Author

De-Qing Shi

Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China

E-mail: [email protected]Search for more papers by this author
First published: 07 March 2013
Citations: 1

Abstract

A series of novel 5-aryl-1-(aryloxyacetyl)-3-(tert-butyl or phenyl)-4-(1H-1,2,4-triazol-1-yl)-4,5-dihydropyrazole 3a3n were synthesized by the annulation of 2-aryloxyacetohydrazides with 3-aryl-1-t-butyl (or phenyl)-2-(1H-1,2,4-triazol-1-yl)prop-2-en-1-ones (2) in the presence of a catalytic amount of acetic acid. Compounds 2 were obtained by the Knoevenagel reactions of 1-t-butyl (or phenyl)-2-(1H-1,2,4-triazol-1-yl)ethanone (1) with aromatic aldehydes in the presence of piperidine. Their structures were confirmed by IR, 1H-NMR, ESI-MS, and elemental analyses. The preliminary bioassay indicated that some compounds displayed moderate to excellent fungicidal activity. For example, compounds 3l, 3m, and 3n possessed 100% inhibition against Cercospora arachidicola Hori at the concentration of 50 mg/L.

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