Cross-coupling reactions of 2-amino-6-chloro-9-2-[(diisopropoxyphosphoryl)methoxy]ethyl}purine (1) and 2-amino-9-2-[(diisopropoxyphosphoryl)methoxy]ethyl}-6-iodopurine (2) with diverse types of organometallic reagents have been studied. Arylboronic acids reacted with 1 to give the corresponding 2-amino-6-arylpurines 3a-3d in good yields. Analogously, trialkylaluminium reagents were used for the preparation of 6-alkyl-2-aminopurines 3k and 3l from 1. Hetarylzinc halides and hetarylstannanes required the use of 2-amino-6-iodopurine 2 to give the corresponding 2-amino-6-hetarylpurines 3e-3j in fair to good yields. A CuI/KF mediated coupling of perfluoroalkylsilanes with 2 afforded the 2-amino-6-perfluoroalkylpurines 3m and 3n in moderate yields. Cleavage of the esters 3 with bromo(trimethyl)silane gave the target free phosphonates 4 that were purified by ion- exchange chromatography. The title compounds were tested on antiviral and cytostatic activity.
2-
氨基-6-
氯-9-2-[(二异丙氧
磷酰基)甲氧基]乙基}
嘌呤(
1)和2-
氨基-9-2-[(二异丙氧
磷酰基)甲氧基]乙基}-
6-碘嘌呤(
2)与多种类型的有机
金属试剂进行了交叉偶联反应的研究。芳基
硼酸与
1反应,得到相应的2-
氨基-6-芳基
嘌呤3a-
3d,收率较高。类似地,三烷基铝试剂用于从
1制备6-烷基-
2-氨基嘌呤3k和
3l。杂环
锌卤化物和杂环
锡烷需要使用
2-氨基-6-碘嘌呤2,才能得到相应的2-
氨基-6-杂环
嘌呤3e-
3j,收率在中等到较好之间。CuI/KF介导的
全氟烷基
硅烷与
2的偶联反应,得到了2-
氨基-6-
全氟烷基
嘌呤3m和
3n,收率适中。用
溴化(三甲基)
硅烷裂解
酯类3,得到目标自由
膦酸酯
4,通过离子交换色谱纯化。这些化合物被测试其抗病毒和抗细胞增殖活性。