在此,我们报告Cp * Co III催化的C H活化方法是创建高度有价值的异喹诺酮和吡啶酮的重要步骤,这些异喹啉酮和吡啶酮可以轻松地用于各种芳香族素,原小ber碱和tylophora生物碱的总合成。这种特殊的CH活化/环化反应是通过多个末端以及内部炔烃偶联伙伴实现的,具有广泛的应用范围和出色的官能团耐受性。本文报道的该方案的合成适用性已在两个Topo-I-抑制剂和两个8-氧代小ber碱核心的合成中得到了证明,这些核心可进一步制成四氢小ber碱和原小ber碱生物碱。此外,这些构件也以方便的方式转化为六种不同的tylophora生物碱。
Dioxirane Epoxidation of 10-Membered-Ring Stilbene Lactams as Synthetic Precursors to Protoberberines
作者:Gema Rodríguez、Luis Castedo、Domingo Domínguez、Carlos Saá、Waldemar Adam、Chantu R. Saha-Möller
DOI:10.1021/jo981829n
日期:1999.2.1
Silylated stilbene lactams 1, prepared by intramolecular addition of an aryl radical to a trimethylsilylacetylene, were converted into protoberberines by dimethyldioxirane (DMD) epoxidation and subsequent acid-catalyzed cyclization of the epoxysilane with HCl. Treatment of the nonsilylated trans- and cis-stilbene derivatives with DMD afforded 13-hydroxytetrahydroprotoberberines and 13a-hydroxy-13-ketotetrahydroprotoberberines as the main products. Tetrahydroprotoberberines were also obtained in excellent yields by the reaction of both silylated and nonsilylated lactams with hydriodic acid.
One-Pot Synthesis of 5,6-Dihydro-8<i>H</i>-dibenzo[<i>a,g</i>]quinolizine-8-ones and Related Isoquinolines; A New Synthesis of Xylopinine
作者:Marietta A. Haimova、Vassil I. Ognyanov、Nicola M. Mollov