Design, synthesis, and herbicidal activity of novel 2-(arylamino)-5-methyl-4-methylene-7-(methylthio)-4<i>H</i>-pyrido[4,3-<i>d</i>][1,3]oxazine-8-carbonitrile derivatives
作者:Yi Sun、Wenfei Huang、Zhiqiang Li、Tao Wang、Jin Luo
DOI:10.1177/1747519819845771
日期:2019.3
A series of 5-methyl-4-methylene-7-methylthio-2-arylmino-4H-pyrido[4,3-d][1,3]oxazine-8-carbonitrile derivatives were synthesized via tandem aza-Wittig and annulation reactions with N-[3-acetyl-5-cyano-2-methyl-6-(methylthio)pyridin-4-yl]imino}triphenylphosphorane and aryl isocyanate in dry dichloromethane. Their structures were clearly confirmed by infrared, 1H NMR, 13C NMR, high-resolution mass
通过串联氮杂-Wittig和环化反应合成了一系列5-methyl-4-methylene-7-methylthio-2-arylmino-4H-pyrido[4,3-d][1,3]oxazine-8-carbonitrile衍生物用N-[3-乙酰基-5-氰基-2-甲基-6-(甲硫基)吡啶-4-基]亚氨基}三苯基正膦和异氰酸芳基酯在干燥二氯甲烷中。它们的结构通过红外、1H NMR、13C NMR、高分辨率质谱和X射线单晶衍射得到明确证实。筛选所有新合成的化合物对单子叶和双子叶植物的除草活性。结果表明目标化合物2-[(4-甲氧基苯基)氨基]-5-甲基-4-亚甲基-7-(甲硫基)-4H-吡啶并[4,3-d][1,3]恶嗪-8 -腈在 100 mg L-1 的浓度下对高粱(单子叶)显示 100% 的抑制率。