Synthetic Studies on Camptothecins. Part 3
作者:Yun-Yan Kuang、Jing-Ze Niu、Fen-Er Chen
DOI:10.1002/hlca.201000049
日期:2010.10
A concise and efficient asymmetric process for the total synthesis of (20S)‐7‐ethyl‐10‐hydroxycamptothecin (=SN‐38; 1f), an active metabolic form of the prodrug irinotecan, is described. This approach features the enantioselective cyanosilylation of indolizinone 4 into the corresponding cyanohydrin 5, mediated by a bifunctional thiourea‐based cinchona alkaloid under mild conditions, and I2‐catalyzed
描述了一种简明有效的不对称过程,用于全合成(20 S)-7-乙基-10-羟基喜树碱(= SN-38; 1f),这是前药伊立替康的活性代谢形式。该方法的特点是在温和条件下由双官能硫脲基金鸡纳生物碱介导的吲哚嗪酮4的对映选择性氰基硅烷化反应,生成相应的氰醇5,以及I 2催化三环内酯6和2-氨基5-羟基苯丙酮的Friedländer缩合反应( = 1-(2-氨基-5-羟基苯基)丙-1-酮)。