作者:Masashi Ohba、Itaru Natsutani
DOI:10.1016/j.tet.2007.10.005
日期:2007.12
the structure assigned to macrocaffrine isolated from Rauwolfia caffra, is presented. The key steps involved are an intramolecular cycloaddition reaction of the oxazole–olefin 10 and a subsequent dehydration that generated the pentacyclic pyridine derivative 14. The spectral data and specific rotation of synthetic 1 were dissimilar to those reported for a natural sample, leaving the structure of this
一个完整的帐户18脱甲基-19-羟基的总合成的Ñ一个-demethyl- Ñ b -methylsuaveoline(1)中,分配给macrocaffrine从分离结构萝芙木caffra,呈现。涉及的关键步骤是恶唑-烯烃10的分子内环加成反应和随后的脱水反应,产生了五环吡啶衍生物14。合成1的光谱数据和比旋光度与天然样品报道的光谱数据和比旋光度不同,因此该R. caffra生物碱的结构尚未确定。