A facile and efficient methodology of the synthesis of 6-(hydroxymethyl)purine derivatives (bases and nucleosides) was developed based on Pd-catalyzed cross-coupling reactions of 6-halopurines or N-protected 2-amino-6-halopurines with (benzoyloxymethyl)zinc iodide followed by deprotection. Regioselective hydroxymethylations of 2,6-dihalopurines were also studied and used for the synthesis of 2-chloro-6-(hydroxymethyl)- or 2,6-bis(hydroxymethyl)purines. The 6-(hydroxymethyl)purine ribonucleoside 5f exerted high cytostatic effect and moderate inhibition of adenosine deaminase, while all the other derivatives were much less effective or entirely inactive.
基于
钯催化的交叉偶联反应,开发出一种简便高效的合成6-(羟甲基)
嘌呤衍
生物(碱基和核苷)的方法。该方法利用6-卤代
嘌呤或N-保护的2-
氨基-6-卤代
嘌呤与(苯甲氧甲基)
锌碘化物进行交叉偶联反应,然后进行去保护。还研究了2,6-二卤代
嘌呤的区域选择性羟甲基化反应,并用于合成2-
氯-6-(羟甲基)或2,6-双(羟甲基)
嘌呤。其中6-(羟甲基)
嘌呤核苷
5f表现出高的细胞静止效应和适度的
腺苷脱氨酶抑制作用,而其他衍
生物则效果较弱或完全无效。