Enantioselective Total Syntheses of (−)‐20‐<i>epi</i>‐Vincamine and (−)‐20‐<i>epi</i>‐Eburnamonine by Ir‐Catalyzed Asymmetric Imine Hydrogenation/Lactamization Cascade
作者:Wen Zhang、Xiangtao Chen、Yi An、Jiaqi Wang、Chunlin Zhuang、Pei Tang、Fener Chen
DOI:10.1002/chem.202002404
日期:2020.8.17
assembly of the C20/C21 adjacent chiral centers has been a formidable challenge in the synthesis of this family. Herein, we report a concise stereoselective total synthesis of two trans‐ring‐fused non‐natural analogues, (−)‐20‐epi‐Vincamine and (−)‐20‐epi‐Eburnamonine, that features the following key steps: a) a continuous‐flow oxidation/lactam alcoholysis cascade producing the symmetrical dihydro‐β‐carboline
在过去的六十年中,对Eburnamine-Vincamine生物碱进行了深入的研究,研究了其杰出的血管舒张活性。在该家族的合成中,C20 / C21相邻手性中心的立体组装是一个巨大的挑战。在此,我们报告了两个反式环稠合的非天然类似物(-)-20- Epi- Vincamine和(-)-20- Epi- Eburnamonine的简洁立体选择性全合成,其主要步骤如下:a)连续流动的氧化/内酰胺醇解级联反应产生对称的二氢-β-咔啉二酯前体,b)高度立体选择性的Ir / f-Binaphane催化的加氢/内酰胺化级联反应,产生了反式-(20 R,21 S)内酰胺酯支架,具有高水平的对映和非对映控制。