Synthesis of Dimethyl Gloiosiphone A by Way of Palladium-Catalyzed Domino Cyclization
作者:Takayuki Doi、Yusuke Iijima、Masaru Takasaki、Takashi Takahashi
DOI:10.1021/jo062546v
日期:2007.5.1
The synthesis of a spiro[4.4]nonane skeleton by the palladium-catalyzed domino cyclization of a linear 7-methylene-2,10-undecadienyl acetate is described. The π-allylpalladium intermediate underwent intramolecular alkene insertion with high intraannular diastereoselectivity, followed by intramolecular Heck-type cyclization, leading to a spiro[4.4]nonane system. Oxidation of the allylic ether moiety
描述了通过钯催化线性的7-亚甲基-2,10-十一碳二烯基乙酸酯的多米诺环化反应来合成螺[4.4]壬烷骨架。π-烯丙基钯中间体经历了高环内非对映选择性的分子内烯烃插入,随后进行了分子内Heck型环化,形成了螺[4.4]壬烷体系。烯丙基醚部分和乙烯基的变换到的氧化外-亚甲基单元提供3,这是公知的合成中间体二甲gloiosiphone A(的2)。