Citation:
TANG Zilong, XIA Zanwen, MA Hongwei, LIU Hanwen, OU Xiaoming. Synthesis of 3,6(8) -Disubstituted-2,4-Dihydro-1,3 benzoxazines via Mannich Reaction and Their Fungicidal Activities[J]. Chinese Journal of Applied Chemistry,
;2013, 30(9): 993-998.
doi:
10.3724/SP.J.1095.2013.20507
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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.
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