A series of 3‐phenyl benzo[d][1,2,3]triazin‐4(3H)‐one derivatives were synthesized through the condensation of phenol E and alkyl (alkenyl, alkynyl) chlorides (bromides, iodide) or alkyl chloroacetates or N‐alkyl chloroacetamides using K2CO3 as the acid acceptor in N,N‐dimethylformamide. Phenol E was prepared from starting material, 5‐amino‐2‐chloro‐4‐fluorophenyl ethyl carbonate, in four steps involving
通过酚E与烷基氯化物(烯基,炔基)氯化物(溴化物,碘化物)或氯乙酸烷基酯的缩合反应,合成了一系列3-苯基苯并[d] [1,2,3]三嗪-4(3H)-one衍生物或使用K 2 CO 3作为N,N-二甲基甲酰胺中的酸受体的N-烷基氯乙酰胺。苯酚E由原料5-氨基-2-氯-4-氟代苯基碳酸乙酯制备,分四个步骤进行,包括酰胺化,还原,重氮化和脱保护基反应。测试了标题化合物对两种双子叶植物和两种单子叶植物的除草活性,其中一些在芽前和芽后处理中表现出对两种双子叶植物的高除草活性。此外,当剂量减少到180和90 g / ha时,化合物F1,F8和F9在芽后处理中对showed菜,紫花苜蓿,菊科,田field,牵牛花,马齿sl和丝绒草表现出高度选择性的抑制活性,但具有除强奸外无除草功效F1,表明可以在与上述杂草属相同的双子叶农作物领域中找到一种抑制双子叶杂草的除草剂。
Access to functionalized 2-pyrones through cascade reactions of α-halothioesters involving DBU-derived ammonium ylides
esters is achieved via a DBU-promoted Michael addition/lactonization/elimination cascade reaction. The reaction mechanism is tentatively elucidated by performing control experiments and high-resolution mass spectrometry analysis, which indicates that the cascade sequence may involve DBU-derived ammoniumylides.
This study presents an approach to access biologically and synthetically intriguing 2-pyridinones containing enaminonitriles, which can be further transformed into 2-pyridinone-fused 2-pyrimidones with fascinating fluorescence emission properties.