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。
Zincate‐Mediated Remote Functionalisation of
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‐Iodobenzyl Derivatives Through Metallotropy in 2‐Methyltetrahydrofuran as Key Solvent
作者:Alexandre Pierret、Clément Denhez、Philippe C. Gros、Alexandre Vasseur
DOI:10.1002/adsc.202200475
日期:2022.11.22
2-MeTHF (2-methyltetrahydrofuran) promotes the zincate-mediated remotefunctionalisation of p-iodobenzyl derivativesthroughmetallotropy with a broad scope. This biosourced solvent remarkably impacted all the key elementary steps involved in the tandem reaction. The method tolerates a wide range of sensitive functionalities within the substrates as well as enolisable and activated or deactivated aromatic