Scalable Synthesis of a New Dihydroxylated Intermediate for Tetrodotoxin and Its Analogues
作者:Toshio Nishikawa、Minoru Isobe、Yoshiki Satake、Takeshi Hiramatsu、Hiroshi Araki
DOI:10.1055/s-0029-1218747
日期:2010.6
The synthesis of a novel intermediate for tetrodotoxin and its analogues, possessing two hydroxy groups at C-8 and C-11, is described. The procedure involves a Diels-Alder reaction between bromolevoglucosenone and a tert-butyldiphenylsilyl-protected isoprenol during which the C-11 group hydroxy is installed. Subsequent transformations, including an Overman rearrangement, affords a cyclohexene intermediate
描述了河豚毒素及其类似物的新型中间体的合成,该中间体在C-8和C-11处具有两个羟基。该方法涉及在溴代氨基葡萄糖葡萄糖酮和叔丁基二苯基甲硅烷基保护的异戊烯醇之间的Diels-Alder反应,在此期间安装了C-11基团羟基。随后的转化,包括Overman重排,提供了含有三氯乙酰胺部分的环己烯中间体,该三氯乙酰胺部分是安装河豚毒素中胍单元所需的氨基官能团。通过三氯乙酰胺的相邻基团参与在C-8处进行羟基化以提供所需的二醇中间体。 河豚毒素-Diels-Alder反应-羟基化-邻近基团参与-超人重排