Enantiospecific Synthesis and Allylation of All-Carbon-Substituted α-Chiral Allylic Stannanes
作者:Eric S. Schmidtmann、Martin Oestreich
DOI:10.1002/anie.200901384
日期:2009.6.8
Once difficult to obtain, the title compounds can be prepared in virtually enantiomerically pure form with a bis(triorganostannyl) zinc reagent (see scheme). Subsequent diastereoselective thermal (left) and Lewis acid promoted reactions (right) illustrate the synthetic potential of these compounds.
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。