Transformations of lignans. Part 11: Oxidation of diphyllin with hypervalent iodine reagents and reductive reactions of a resulting 1-methoxy-1-aryl-4-oxonaphthalene lactone
作者:R. Venkateswarlu、C. Kamakshi、P.V. Subhash、S.G.A. Moinuddin、D. Rama Sekhara Reddy、R.S. Ward、A. Pelter、T. Gelbrich、M.B. Hursthouse、S.J. Coles、M.E. Light
DOI:10.1016/j.tet.2006.02.050
日期:2006.5
affords a 1-methoxy-1-aryl-4-oxonaphthalene lactone 6. Reduction of 6 with lithium aluminium hydride yields, inter alia, 3,4-dihydrodiphyllin 13, while reaction with sodium in ethanol yields 8 as a major product. These reactions illustrate that selective oxidation followed by reduction provides a facile route for the conversion of a 1-arylnaphthalene lactone to novel functionalised naphthalene and dihydronaphthalene
用甲醇中的二乙酸苯碘鎓(PIDA)处理双叶连环素4,得到1-甲氧基-1-芳基-4-芳氧基萘内酯6。用氢化铝锂还原6,除其他外,得到3,4-二氢二氢叶绿素13,而与乙醇中的钠反应得到作为主要产物的8。这些反应表明,选择性氧化然后还原提供了将1-芳基萘内酯转化为新型官能化萘和二氢萘衍生物的简便途径。特别令人感兴趣的是,氧化作用会间接激活γ-内酯的亚甲基位置(C-10),然后可以潜在地取代该位置以生成一系列新的木脂素。的反应用羟胺和苄氧基胺形成的第6步也以在C-10的初始攻击的方式进行。