A Straightforward Route to Functionalized <i>trans</i>-Diels−Alder Motifs
作者:Jun Hee Lee、Yandong Zhang、Samuel J. Danishefsky
DOI:10.1021/ja1073855
日期:2010.10.20
A sequence consisting of a Lewis acid-catalyzed Diels-Alder reaction on a 2-halocyclohexenone, followed by reductive alkylation, provides a route to trans-fused octalinones bearing angularmethyl groups with functionality corresponding to that which would have been possible from a trans-directed Diels-Alder reaction.
Total Synthesis of (−)-Xylogranatopyridine B via a Palladium-Catalyzed Oxidative Stannylation of Enones
作者:Alexander W. Schuppe、David Huang、Yifeng Chen、Timothy R. Newhouse
DOI:10.1021/jacs.7b13189
日期:2018.2.14
We report a total synthesis of the pyridine-containing limonoid alkaloid (-)-xylogranatopyridine B in 11 steps from commercially available dihydrocarvone. The central pyridine ring was assembled by a late-stage fragment coupling approach employing a modified Liebeskind pyridine synthesis. One fragment was prepared by an allyl-palladium catalyzed oxidativeenone β-stannylation, in which the key bimetallic
我们报告了含吡啶的柠檬苦素生物碱 (-)-xylogranatopyridine B 在 11 个步骤中从市售二氢香芹酮的全合成。中央吡啶环通过后期片段偶联方法组装,采用改良的 Liebeskind 吡啶合成。一个片段是通过烯丙基-钯催化的氧化烯酮β-甲锡烷基化制备的,其中关键的双金属β-甲锡烷基钯烯醇化物中间体经历了β-氢化物消除。这种方法还允许在烯酮的 β 位引入烷基和甲硅烷基。