Studies on the syntheses of heterocyclic compounds. Part CCCXV. Modified total synthesis of (±)-galanthamine through phenol oxidation
作者:T. Kametani、K. Yamaki、H. Yagi、K. Fukumoto
DOI:10.1039/j39690002602
日期:——
(±)-galanthamine (II) and (±)-epigalanthamine (XXI) in yields of 50 and 40% respectively. Oxidation of (II) with manganese dioxide afforded (±)-narwedine (XIX) This work also constitutes a formal synthesis of (±)-lycoramine.
用铁氰化物氧化2-溴-5-羟基-N-(4-羟基苯乙基)-4-甲氧基-N-甲基苯甲酰胺(VIII),以优异的收率(40%)得到了纳维丁型烯酮(X)。用氢化铝锂还原(X)得到(±)-加兰他敏(II)和(±)-表兰胺(XXI),产率分别为50%和40%。用二氧化锰将(II)氧化,得到(±)-narwedine(XIX)。这项工作也构成了(±)-lycoramine的正式合成。