Enantioselective Total Synthesis and Confirmation of the Absolute and Relative Stereochemistry of Streptorubin B
作者:Dennis X. Hu、Michael D. Clift、Kiel E. Lazarski、Regan J. Thomson
DOI:10.1021/ja109165f
日期:2011.2.16
cyclization/Wittig reaction and an anionic oxy-Cope rearrangement to forge the crucial 10-membered ring. Comparisons between CD spectra of synthetic and natural samples of streptorubin B coupled with X-ray crystallography allowed for the determination of the absolute stereochemistry of this natural product for the first time. These studies also provided unambiguous proof of the relative configuration between the
描述了吡咯烷天然产物链红素 B 的对映选择性全合成。简洁路线中的关键步骤包括应用一锅对映选择性羟醛环化/Wittig 反应和阴离子氧-Cope 重排,以形成关键的 10 元环。链红素 B 的合成和天然样品的 CD 光谱与 X 射线晶体学的比较,首次允许确定这种天然产物的绝对立体化学。这些研究还为丁基侧链和双吡咯亚基之间的相对构型提供了明确的证据。其他研究揭示了一种新型的阻转立体选择性 Paal-Knorr 吡咯缩合,并提供了对天然产物阻转异构化障碍的基本实验见解。