A Unified Strategy Targeting the Thiodiketopiperazine Mycotoxins Exserohilone, Gliotoxin, the Epicoccins, the Epicorazines, Rostratin A and Aranotin
作者:Ulrike Gross、Martin Nieger、Stefan Bräse
DOI:10.1002/chem.201001169
日期:——
A unified synthetic strategy directed towards mycotoxins belonging to the thiodiketopiperazine family is reported. The building blocks for a number of natural products—including exserohilone, gliotoxin, the epicoccins, the epicorazines, rostratin A and aranotin—have been synthesised stereoselectively from a common precursor. This key intermediate was constructed through an efficient and highly diastereoselective
据报道,针对属于硫代二酮哌嗪家族的真菌毒素的统一合成策略。已经从常见的前体中选择性地合成了许多天然产物的组成部分,包括exserohilone,gliotoxin,epicoccins,epicocorazines,rostratin A和aranotin。该关键中间体是通过在烯酮与衍生自L-焦谷氨酸的烯甲酸氨基甲酸酯之间进行高效且高度非对映选择性的[2 + 2]环加成反应而构建的。第二个环的成环反应是通过闭环复分解和烯醇醚-烯烃闭环复分解完成的,以提供顺式和反式退火的氮杂双环环己烯酮,以及退火的七元环状烯醇醚。Pd催化的乙酸烯丙酯的消除产生了葡聚糖毒素的环己二烯结构。证明了一种结构单元的二聚化以提供二酮哌嗪核心。