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Total Syntheses of the Tylophora Alkaloids Cryptopleurine,(-)-Antofine,(-)-Tylophorine,and (-)-Ficuseptine C

机译:Tylophora生物碱隐尿嘧啶,(-)-Antofine,(-)-酪氨酸和(-)-榕树素C的总合成

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摘要

A concise,efficient and mod-ular approach to the tylophora alka-loids is described,a family of potent cytotoxic agents that are equally effec-tive against drug sensitive and multi-drug resistant cancer cell lines.The ad-vantages of the chosen route are illus-trated by the total syntheses of the phenanthroquinolizidine cryptopleur-ine (1) and the phenanthroindolizidines (-)-antofine (2),(-)-tylophorine (3),and their only recently isolated conge-ner (-)-ficuseptine C (4).The key steps consist in a Suzuki cross-coupling between a (commercial) boronic acid and a simple aryl-l,2-dihalide followed by elaboration of the resulting products into the corresponding 2-alkynyl-bi-phenyl derivatives 27,33,41 and 46.The latter undergo PtCl_2-catalyzed cy-cloisomerizations with formation of the functionalized phenanthrenes 28,34,42 and 47,which were transformed into the targeted alkaloids by a deprotec-tion/Pictet-Spengler annulation tandem.Due to the flexibility and robust character of this approach,it might enable a systematic exploration of the pharmacological profile of this promising class of bioactive natural products.
机译:描述了一种简便,高效且模块化的方式来处理tylophora生物碱,这是一种有效的细胞毒性剂家族,对药物敏感性和多重耐药性的癌细胞系具有同等效力。所选途径的优势由吩噻吩并喹唑烷隐嘌呤(1)和菲硫唑烷(-)-antofine(2),(-)-酪氨酸(3)以及它们最近才分离的凝乳剂(-)- Ficuseptine 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-联苯基衍生物27、33、41和46。后者经过PtCl_2催化的cy-异构化反应,形成官能化的菲28、34、42和47,并通过反保护/皮克特-斯彭格勒环化串联将其转化为目标生物碱。 。由于这种方法具有灵活性和鲁棒性,它可能能够系统地研究这种有前途的生物活性天然产物的药理特性。

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