Total Synthesis of Apoptolidin: Part 2. Coupling of Key Building Blocks and Completion of the Synthesis
作者:K. C. Nicolaou、Yiwei Li、Konstantina C. Fylaktakidou、Helen J. Mitchell、Kazuyuki Sugita
DOI:10.1002/1521-3773(20011015)40:20<3854::aid-anie3854>3.0.co;2-d
日期:2001.10.15
No less than 30 stereogenic elements, a highly unsaturated 20-membered macrocyclic system, four carbohydrate units, and unique biological activity, make the natural occurring apoptolidin (1) a challenging synthetic target. The retrosynthetic analysis revealed five key building blocks-three for the construction of the macrolide ring B and two prospective pendant saccharide units-which were synthesized
不少于30种立体成因元素,高度不饱和的20元大环系统,4个碳水化合物单元以及独特的生物活性,使天然存在的细胞凋亡素(1)成为具有挑战性的合成靶标。逆向合成分析揭示了五个主要结构单元,三个用于大环内酯环B的构建,两个潜在的侧基糖单元,它们以高度会聚的方式合成,然后连接在一起。在最终的脱保护,纯化和表征过程中,Apooptolidin的相当不稳定的性质被证明特别具有挑战性。