Palladium-Catalyzed Aryl Amination Reactions of 6-Bromo- and 6-Chloropurine Nucleosides
作者:Paul F. Thomson、Pallavi Lagisetty、Jan Balzarini、Erik De Clercq、Mahesh K. Lakshman
DOI:10.1002/adsc.200900728
日期:——
ribonucleosides and the 2'-deoxy analogues with aryl amines are described. Efficient conversions were observed with Pd(OAc)(2)/Xantphos/Cs(2)CO(3), in PhMe at 100 degrees C. Reactions of the bromo nucleoside derivatives could be conducted at a lowered catalytic loading (5 mol % Pd(OAc)(2)/7.5 mol % Xantphos), whereas good product yields were obtained with a higher catalyst load (10 mol % Pd(OAc)(2)/15
描述了6-溴-以及6-氯嘌呤核糖核苷和2'-脱氧类似物与芳基胺的钯催化的CN键形成反应。在100°C的PhMe中,使用Pd(OAc)(2)/ Xantphos / Cs(2)CO(3)观察到了有效的转化。溴核苷衍生物的反应可以在较低的催化负载下进行(5 mol%Pd (OAc)(2)/7.5 mol%Xantphos),而当使用氯代类似物时,催化剂负载较高时(10 mol%Pd(OAc)(2)/ 15 mol%Xantphos)获得良好的产品收率。在所评估的实施例中,与乙酰基相比,对羟基的甲硅烷基保护看起来更好。该方法已通过与各种芳基胺的反应以及生物学上相关的脱氧腺苷和腺苷二聚体的合成进行了评估。