Total Syntheses of the Tylophora Alkaloids Cryptopleurine, (−)-Antofine, (−)-Tylophorine, and (−)-Ficuseptine C
作者:Alois Fürstner、Jason W. J. Kennedy
DOI:10.1002/chem.200600592
日期:2006.9.25
sensitive and multidrug resistant cancer cell lines. The advantages of the chosen route are illustrated by the total syntheses of the phenanthroquinolizidine cryptopleurine (1) and the phenanthroindolizidines (-)-antofine (2), (-)-tylophorine (3), and their only recently isolated congener (-)-ficuseptine C (4). The key steps consist in a Suzuki cross-coupling between a (commercial) boronic acid and a
描述了一种简单,有效和模块化的方法来处理tylophora生物碱,这是一种有效的细胞毒剂家族,对药物敏感性和多药耐药性癌细胞系同样有效。所选路线的优势可通过邻菲喹啉嗪隐尿素(1)和菲硫唑烷(-)-antofine(2),(-)-酪氨酸(3)以及它们最近才分离的同类物(-)-的合成来说明榕肽C(4)。关键步骤包括(商业)硼酸与简单的芳基1,2-二卤化物之间的Suzuki交联,然后将所得产物精制为相应的2-炔基-联苯衍生物27、33、41和46后者经过PtCl2催化的环异构化,形成官能化的菲28、34、42和47,通过脱保护/ Pictet-Spengler环空串联将其转化为目标生物碱。由于这种方法的灵活性和鲁棒性,它可能能够系统地探索这种有前途的生物活性天然产物类别的药理特性。