作者:Takahiro Ichige、Yusuke Okano、Naoki Kanoh、Masaya Nakata
DOI:10.1021/jo802249k
日期:2009.1.2
The total synthesis of methyl sarcophytoate (1), a marine natural biscembranoid, has been achieved by the thermal Diels−Alder reaction between the 14-membered dienophile unit, methyl sarcoate (2), and the 14-membered diene unit 64. Methyl sarcoate (2) was prepared using n-BuLi-Bu2Mg-mediated dithiane coupling, Kosugi−Migita−Stille coupling, and Grubbs ring-closing metathesis. The diene unit 64 was
十二烷基肌醇二甲酯(1)(一种海洋天然双树皮)的总合成已通过14元亲二烯体单元,十二烷酸甲酯(2)和14元二烯单元64之间的热Diels-Alder反应实现。使用n -BuLi-Bu 2 Mg介导的二噻吩偶联,Kosugi-Migita-Stille偶联和Grubbs闭环复分解反应制备肌氨酸甲酯(2)。使用Sharpless不对称环氧化,Grubbs闭环易位,6-exo-tet环氧化物开环和n -BuLi-Bu 2 Mg介导的Ito-Kodama环化反应制备二烯单元64。2之间的最终Diels-Alder反应和64继续进行高部位,内/外,π-面,和区域选择性。在该反应过程中,在C4位置观察到部分E → Z异构化。