A novel preparation of (+)-methyl pederate (4), a key intermediate in syntheses of mycalamides (1), marine natural products from a New Zealand sponge of the genus Mycale, is described. The key step involves palladium-catalyzed intramolecular allylic alkylation of the carbonate 21, derived from (+)-(4R,5R,E)-5-(tert-butyldimethylsiloxy)-4-methyl-2-hexenol (13), yielding lactones 5 in 87% yield. Demethoxycarbonylation
描述了一种新的制备方法,该方法制备了(+)-山酸甲酯(4),它是合成Mycalamides(1)的关键中间体,而mycalamides(1)是来自Mycale属新西兰海绵的海洋
天然产物。关键步骤涉及衍生自(+)-(4R,5R,E)-5-(叔丁基二甲基甲
硅烷氧基)-
4-甲基-2-己烯醇(13)的
钯催化的
碳酸酯21的分子内烯丙基烷基化反应,生成内酯5,收率87%。环化产物5的脱甲氧基羰基化和进一步的官能团转化导致(+)-山ped酸甲酯(4)。