The cascade radical cyclisation approach to prenylated alkaloids: synthesis of stephacidin A and notoamide B
作者:Nigel S. Simpkins、Ilias Pavlakos、Michael D. Weller、Louise Male
DOI:10.1039/c3ob40979a
日期:——
A strategy for the synthesis of members of the prenylated indole alkaloid family is described, which involves a radical cascade process of an appropriately substituted diketopiperazine (DKP) core structure. Several approaches to the generation of the initial radical were explored, with the most successful involving treatment of a sulfenyl substituted DKP under classical reductive conditions by heating
描述了合成炔丙基吲哚生物碱家族成员的策略,该策略涉及适当取代的自由基级联过程 二酮哌嗪(DKP)核心结构。探索了几种产生初始自由基的方法,最成功的方法是在经典还原条件下,通过用Bu 3 SnH和自由基引发剂加热,处理亚磺酰基取代的DKP 。所需的,完全取代的,自由基的前体DKP结构是使用区域和立体控制的简单脯氨酸的烯醇式化学方法制备的色氨酸衍生的DKP。新方法允许快速访问关键的多环二氢吲哚结构,该结构被转化为天然产物Stephacidin A或NotoamideB。