Synthesis of Elemane Bis-Lactones from Santonin – Synthesis of the Reported Structure ofseco-Isoerivanin Pseudo Acid and Formal Synthesis of (+)-8-Deoxyvernolepin
作者:Gonzalo Blay、Luz Cardona、Begoña García、Luisa Lahoz、José R. Pedro
DOI:10.1002/1099-0690(200006)2000:11<2145::aid-ejoc2145>3.0.co;2-n
日期:2000.6
The synthesis of the reported structure for seco-isoerivanin pseudo acid (1) and of an elemane bis-lactone 5 from santonin (4) through a common vinylic precursor 12 is described. Compound 5 is a known intermediate in a previous synthesis of the antitumor compound (+)-8-deoxyvernolepin (3). The vinyl group of 12 underwent a regio- and diastereoselective anti addition of an external electrophile and
描述了已报道的 seco-isoerivanin 假酸 (1) 结构和来自 santonin (4) 通过常见乙烯基前体 12 的榄香烯双内酯 5 的合成。化合物 5 是先前合成抗肿瘤化合物 (+)-8-deoxyvernolepin (3) 中的已知中间体。12 的乙烯基经历了外部亲电子试剂的区域和非对映选择性反加成和分子内缩合,以产生硒内酯 13 或羟基内酯 17。内酯 13 和 17 分别作为 1 和 5 全合成的关键中间体. 在比较天然产物和合成产物的光谱数据的基础上,建议将 seco-isoerivanin 假酸的结构修改为 C-10 差向异构体。