In order to obtain adducts of 8-methoxypsoralen (8-MOP, 1) and singlet oxygen (1O2), the oxidation of 1 with chemically generated singlet oxygen in H2O2-NaOCl was undertaken. Bioassay-directed fractionation of the crude oxidized products has led to the isolation and characterization of a novel derivative of 1, 2, 3-dihydro-2, 9-dimethoxy-3-hydroxy-7H-furo[3, 2-g][1]benzopyran-7-one (2) as a substance inhibiting chemotactic activity of polymorphonuclear neutrophils toward anaphylatoxin C5a des Arg. The structure of 2 was determined from the spectroscopic data and by correlation with its acetate (2a). Furthermore, the oxidation of 1 in H2O2-NaOCl afforded 5-chloro-9-methoxy-7H-furo[3, 2-g][1]benzopyran-7-one (3) and 6-formyl-7-hydroxy-8-methoxy-2H-1-benzopyran-2-one (4) along wiht 1, but they exhibited no such activity.
为了获得
8-甲氧基补骨脂素 (8-MOP, 1) 和单线态氧 (1O2) 的加合物,在
H2O2-NaOCl 中用
化学生成的单线态氧氧化 1。对粗氧化产物进行
生物测定指导的分馏,分离并表征了 1, 2, 3-二氢-2, 9-二甲氧基-3-羟基-7H-
呋喃[3, 2-g][的新型衍
生物1]苯并
吡喃-7-酮(2)作为抑制多形核中性粒细胞对过敏毒素C5a des Arg的趋化活性的物质。 2 的结构是根据光谱数据并通过与其
乙酸盐 (2a) 的相关性确定的。此外,1在 -NaOCl中的氧化得到5-
氯-9-甲氧基-7H-
呋喃[3, 2-g][1]苯并
吡喃-7-酮(3)和6-甲酰基-7-羟基-8 -甲氧基-2H-1-苯并
吡喃-2-酮(4)和1,但它们没有表现出这样的活性。