Total Synthesis of Purported Cephalosporolides H and I, Penisporolide B, and Their Stereoisomers
作者:Jian Wang、Rongbiao Tong
DOI:10.1021/acs.joc.6b00788
日期:2016.5.20
β-hydroxy cyclic ethers and dehydrative ring-contraction rearrangement of 10-membered lactones. Synthetic utility of this strategy was demonstrated by total syntheses of 12 Me2SAFLs, corresponding to the purported cephalosporolide H (CesH), cephalosporolide I (CesI), and penisporolide B (PenB) and their possible diastereomers. Comprehensive NMR data analysis suggested that the tricyclic Me2SAFL core of
据报道,开发了一种统一的,受生物启发的合成策略,以获取独特的2,2-二甲基-[5,5]-螺缩醛-顺式-融合-γ-内酯的四种可能的非对映体(Me 2 SAFL),其特征在于吡啶鎓氯铬酸盐(PCC)促进β-羟基环醚的氧化环扩张和10元内酯的脱水环收缩重排。通过合成12个Me 2 SAFL证明了该策略的合成效用,分别对应于声称的头孢菌素H(CesH),头孢菌素I(CesI)和Penisporolide B(PenB)及其可能的非对映异构体。全面的NMR数据分析表明,应将CesH,CesI和PenB的三环Me 2 SAFL核修改为相同的相对值(3 R *,4R *,6 S *,9 R *)构型,并且侧链需要未知的结构修订。