Chinese Journal of Applied Chemistry

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Synthesis of 3,6 (8)-Disubstituted -2,4-Dihydro-1,3-benzoxazines via Mannich Reaction and Their Fungicidal Activity

TANG Zilong1,2,3*, XIA Zanwen1, MA Hongwei1, LIU Hanwen1,2,3, OU Xiaoming2,4   

  1. (1.School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;
    2.Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education,
    Hunan University of Science and Technology,Xiangtan 411201,China;
    3.Hunan Provincial University,Key Laboratory of QSAR/QSPR Hunan University of Science and Technology,Xiangtan 411201,China;
    4.National Engineering Research Center for Agrochemicals,Hunan Research Institute of Chemical Industry,Changsha 410014,China)
  • Received:2012-11-06 Revised:2013-01-14 Published:2013-09-10 Online:2013-09-10
  • Contact: Tang

Abstract: A series of novel 3,6(8)-disubstituted 2,4-dihydro-1,3-benzoxazines was synthesized by Mannich reactions of substituted anilines with paraformaldehyde and substituted phenols in the absence of catalyst. The results show that substituted phenols and anilines with electron-donating groups on the phenyl ring give higher yields than those with electron-withdrawing groups. The structures of the products were characterized by 1H NMR, 13C NMR, IR and MS. The fungicidal activity of the title compounds was preliminarily evaluated. Compounds 4j and 4d show 86.1% and 81.5% activity against Sclerotonia sclerotiorum at the concentration of 25 mg/L, respectively. Compound 4i exhibits 81.6% activity against Botrytis cinerea.

Key words: disubstituted-dihydro-benzoxazines, synthesis, Sterilization Activity

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