作者:Jie Yu、Mingze Yang、Yian Guo、Tao Ye
DOI:10.1021/acs.orglett.9b01113
日期:2019.5.17
Highlights of this synthesis include a novel and efficient transannular Michael addition/lactone reduction sequence to construct the highly substituted 2,6-trans-tetrahydropyran, a diastereoselective IBr-induced iodocarbonate cyclization to introduce the C17 stereogenic center, and a Diels–Alder/aromatization reaction to install the highly substituted aromatic ring.
从已知的醛8到27步,已经完成了结构复杂的海洋抗肿瘤药物psymberin的收敛,立体控制的全合成。该合成的重点包括新颖且有效的跨环迈克尔加成/内酯还原序列,以构建高度取代的2,6-反式-四氢吡喃,非对映选择性的IBr诱导的碘代碳酸氢盐环化,以引入C17立体异构中心,以及Diels-Alder /芳构化安装高度取代的芳环的反应。