Palladium-Catalyzed Intramolecular Allylic Alkylation Reaction in Marine Natural Product Synthesis: Enantioselective Synthesis of (+)-Methyl Pederate, a Key Intermediate in Syntheses of Mycalamides
作者:Masahiro Toyota、Masako Hirota、Youichi Nishikawa、Keiichiro Fukumoto、Masataka Ihara
DOI:10.1021/jo9805246
日期:1998.8.1
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)。