A Concise Approach to (±)-Tubifoline Based on the Palladium-Catalyzed Cross-Coupling Reaction of Indolylborate
摘要:
The palladium-catalyzed tandem cyclization-cross-coupling protocol using 1H-indol-2-yltrialkylborate (indolylborate) proved to be a versatile approach to the generation of 2-(4-piperidylmethyl)indole, which was successfully used for the preparation of (+/-)-tubifoline.
开发了吲哚硼酸酯(2)与乙烯基溴(9)的钯催化串联环化-交叉偶联反应,用于制备吡啶并[4,3- b ]咔唑。2a的交叉偶联反应提供了己三烯(10),然后用辐射或路易斯酸将10环化为吡啶并[4,3- b ]咔唑(12)。使用吲哚硼酸酯(2c)进行交叉偶联反应,通过相似的反应序列获得了玫瑰树碱的新型结构。