Synthesis of Oncinotin-11-one, a Macrocyclic Polyamine Alkaloid fromOncinotis tenuiloba
作者:Martin K.-H. Doll、Armin Guggisberg、Manfred Hesse
DOI:10.1002/hlca.19960790511
日期:1996.8.7
This paper presents a short synthesis of oncinotin-11-one (11), a minor alkaloid of Oncinotis tenuiloba (Apocynaceae). Based on a disconnection approach, the spermidine portion of the key intermediate 6 was constructed consecutively by simple N-alkylations starting from ethyl piperidine-2-carboxylate (1). Treatment of 6 with in situ lithiated 2-[(10-bromodecyl)oxy]tetrahydropyran resulted in the formation
本文介绍了短的生物碱Oncinotis tenuiloba(Apocynaceae)的oncinotin-11-one(11)的简短合成。基于分离的方法,关键中间体6的亚精胺部分通过从哌啶-2-羧酸乙酯(1)开始的简单N-烷基化连续地构建。用原位锂化的2-[((10-溴modecyl)氧基]四氢吡喃处理6导致内酰胺N-原子同时脱保护下形成酮基,以71%的收率得到氨基酮7。四氢-2 H-吡喃-2-基(Thp)部分和Jones的裂解氧化所得醇8,得到氨基酸9,将其环化。最后的N-脱苄基化10提供了天然生物碱11。在该合成中仅需要两个保护基。的反应ñ -烷基内酰胺与有机金属试剂进行了讨论。