Synthesis and Fungicidal Activity of （E）-5-[1-（2-Oxo- 1 -oxaspiro[4,5]dec/non-3-en-3-yl）ethylidene]-2- aminoimidazolin-4-one Derivatives

The novel fungicidal agents, （E）-5-[1-（2-oxo-l-oxaspiro[4,5]dec/non-3-en-3-yl）ethylidene]-2-aminoimidazolin- 4-one derivatives, were designed and synthesized in moderate to excellent yields in four steps using a-hydroxyketone and diketene as raw materials and characterized by HR-ESI-MS, 1H NMR and X-ray diffraction. The preliminary bioassay showed that some of these compounds, such as 5e, 6a, 6e, and 7h exhibit 87.8%, 91.3%, 89.9% and 87.8% inhibition rates against Sclerotinia scleotiorum, 3b, 3c, 4c and 7h exhibit 96.4%, 92.5%, 90.3% and 76.9% inhibition rates against Phytophthora capsici at the concentration of 50 μg/mL, respectively. These compounds exhibited significant fungicidal activities against S. scleotiorum and P. capsici with EC50 values of 2.56 --11.60 μg/mL, and compounds 6e and 7h exhibited weak inhibition against the spore germination of S. scleoti- orum, while the spore germination ofP. capsici was strongly inhibited by compound 7h solution. Scanning electron microscopy （SEM） and transmission electron microscopy （TEM） observation indicated that compound 7h had a significant impact on the structure and function of the hyphal cell wall ofP. capsici mycelium.

川赤芍的化学成分分离鉴定

目的:研究川赤芍的化学成分。方法:取川赤芍(30 kg),用95%乙醇回流提取4次,提取液过滤后合并,减压浓缩得浸膏,将浸膏加水混悬后依次用石油醚、二氯甲烷、乙酸乙酯、正丁醇进行萃取,得到相应的5个部位,石油醚部分、二氯甲烷部分、乙酸乙酯部分、正丁醇部分和水部分。各部位分别采用硅胶,Sephadex LH-20,ODS柱色谱及中压制备液相,高压制备液相等方法对其进行分离纯化,得到的化合物用红外、质谱、核磁共振谱等波谱技术进行鉴定。结果:从川赤芍中分离纯化得到16个化合物,分别鉴定为(1S,5R,6R)-1,8-dihydroxypin-2-en-4-one (1),(2-hydroxyl)-phenyl-methyl-β-D-xylopyranoside(2),flufuran (3),6’-O-vanillylpaeoniflorin (4),2,5-二羟基肉桂酸甲酯(5),(1S,2S,5R,6R)-1,8-dihydroxypin-4-one (6),palbinone (7),4-O-甲基芍药苷(8),4-O-乙基芍药苷(9),苯甲酰氧化芍药苷(10),苯甲酸(11),没食子酸(12),没食子酸甲酯(13),没食子酸乙酯(14),β-谷甾醇(15),1,2,3,4,6-O-五没食子酰葡萄糖(16)。结论:其中,化合物1,2为新的天然化合物,化合物3为首次从芍药属中分离得到,化合物4~7为首次从该植物中分离得到。