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Molecules 2012, 17(3), 3181-3201; doi:10.3390/molecules17033181
Article

Facile Synthesis and Herbicidal Evaluation of 4H-3,1-Benzoxazin-4-ones and 3H-Quinazolin-4-ones with 2-Phenoxymethyl Substituents

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Received: 18 January 2012 / Revised: 27 February 2012 / Accepted: 1 March 2012 / Published: 14 March 2012
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Abstract

Series of 4H-3,1-benzoxazin-4-ones and 3H-quinazolin-4-ones with phenoxy-methyl substituents were rationally designed and easily synthesized via one-pot N-acylation/ring closure reactions of anthranilic acids with 2-phenoxyacetyl chlorides to yield the 4H-3,1-benzoxazin-4-ones, and subsequently substituted with amino derivatives to obtain the 3H-quinazolin-4-ones. The herbicidal evaluation was performed on the model plants barnyard grass (a monocotyledon) and rape (a dicotyledon), and most of the title compounds displayed high levels of phytotoxicity. The active substructure and inhibitory phenotype analysis indicated that these compounds could be attributed to the class of plant hormone inhibitors. A docking study of several representative compounds with the hormone receptor TIR1 revealed an appreciable conformational match in the active site, implicating these compounds are potential lead hits targeting this receptor.
Keywords: 4H-3,1-benzoxazin-4-ones; 3H-quinazolin-4-ones; active substructure combination; herbicidal activity; auxinic receptor TIR1 4H-3,1-benzoxazin-4-ones; 3H-quinazolin-4-ones; active substructure combination; herbicidal activity; auxinic receptor TIR1
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Aibibuli, Z.; Wang, Y.; Tu, H.; Huang, X.; Zhang, A. Facile Synthesis and Herbicidal Evaluation of 4H-3,1-Benzoxazin-4-ones and 3H-Quinazolin-4-ones with 2-Phenoxymethyl Substituents. Molecules 2012, 17, 3181-3201.

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