通过相应保护的4,6-二氯嘧啶基[4,5- b ]的选择性Pd催化交叉偶联反应,制备了一系列新的在位置4带有苯基或杂芳基的嘧啶并[4,5- b ]吲哚核糖核苷。吲哚核糖核苷与(杂)芳基硼酸或锡烷,然后脱保护。在更苛刻的条件下和使用X-Phos配体的进一步交叉偶联在位置6进行,得到4,6-二取代的嘧啶并[4,5- b ]吲哚核糖核苷。这些化合物中的某些显示出对登革热病毒的抗病毒活性。
Ethyl Cyanoacetate: A New Cyanating Agent for the Palladium-Catalyzed Cyanation of Aryl Halides
作者:Shuyan Zheng、Chunhui Yu、Zhengwu Shen
DOI:10.1021/ol3014914
日期:2012.7.20
A new Pd-catalyzed cyanation reaction has been discovered using ethyl cyanoacetate as the cyanating reagent. A variety of electron-rich and electron-deficient aryl halides were efficiently converted into their corresponding nitriles in good to excellent yields.