A Practical Synthesis of the Ansa Chain of Benzenic Ansamycin Antibiotics: Total Synthesis of an Ansatrienol Derivative
作者:Andreas Kirschning、Dmitry Kashin、Axel Meyer、Rüdiger Wittenberg、Kai-Uwe Schöning、Stefan Kamlage
DOI:10.1055/s-2006-958967
日期:2007.1
features of the synthesis are the formation of the Z-configured trisubstituted double bond by a one-pot esterification of allyl(diisopropoxy)borane and ring-closing metathesis, formation of the β-keto ester via ethyl diazoacetate addition to an aldehyde, and use of the Duthaler-Hafner acetate aldol reaction for the introduction of the stereocenter at C3. The practicality of this synthesis is demonstrated
描述了一种实用且立体控制的合成苯环安沙霉素(mycotrienins)链的方法,该方法可以放大到数克的数量。该合成的关键特征是通过烯丙基(二异丙氧基)硼烷的一锅酯化和闭环复分解形成Z-构型三取代双键,通过重氮乙酸乙酯与醛的加成形成β-酮酯,以及使用 Duthaler-Hafner 醋酸羟醛反应在 C3 处引入立体中心。该合成的实用性通过制备红红三烯酚衍生物来证明,该衍生物代表红红三萜的正式全合成。