Total Syntheses of (+)-Ricinelaidic Acid Lactone and of (−)-Gloeosporone Based on Transition-Metal-Catalyzed C−C Bond Formations
作者:Alois Fürstner、Klaus Langemann
DOI:10.1021/ja9719945
日期:1997.10.1
Total syntheses of the macrolides (R)-(+)-ricinelaidic acid lactone (6) and (−)-gloeosporone (7), a fungal germination self-inhibitor, are presented, which are distinctly shorter and more efficient than any of the previous approaches to these targets reported in the literature. Both of them benefit from the remarkable ease of macrocyclization of 1,ω-dienes by means of ring-closing olefin metathesis
提出了大环内酯 (R)-(+)-蓖麻酸内酯 (6) 和 (-)-gloeosporone (7)(一种真菌萌发自我抑制剂)的全合成,它们明显比任何一种更短且更有效。以前在文献中报道过这些目标的方法。它们都受益于通过使用钌卡宾 1a 作为催化剂前体的闭环烯烃复分解 (RCM) 的 1,ω-二烯大环化的显着容易性。在催化量的 Ti(OiPr)4 和双三氟甲磺酸酰胺 18 存在下,通过二烷基锌试剂与醛的对映选择性加成和/或 Keck 等人开发的醛的立体选择性烯丙基化,很容易形成二烯底物。使用烯丙基三丁基锡烷与由 Ti(OiPr)4 和 (S)-(-)-1,1'-bi-2-naphthol 形成的催化剂组合。