In (S)-1-[3-hydroxy-2-(phosphonomethoxy)propyl]cytosine (HPMPC) and (S)-9-[3-hydroxy-2-(phosphonomethoxy)propyl]adenine (HPMPA) with 3-hydroxy functions protected with 4,4'-dimethoxytrityl (DMTr) groups, phosphonate groups were transformed to the morpholides and treated with bis(tributylammonium) diphosphate. Selective cleavage of the DMTr group in the presence of the labile diphosphate residue was achieved in water at pH 2.5. Purification by charcoal adsorption followed by anion exchange chromatography afforded phosphonate-diphosphate compounds (HPMPCpp, HPMPApp).
在(S)-1-[3-羟基-2-(磷酸甲氧基)丙基]胞嘧啶(HPMPC)和(S)-9-[3-羟基-2-(磷酸甲氧基)丙基]腺嘌呤(HPMPA)中,含有4,4'-二甲氧基三苯基甲基(DMTr)基团保护的3-羟基功能,磷酸酯基被转化为吗啉酯,并与双(三丁基铵)二磷酸盐反应。在pH 2.5的水中,DMTr基团在易水解的二磷酸残基存在下实现了选择性裂解。经过活性炭吸附和阴离子交换色谱纯化后得到磷酸酯-二磷酸盐化合物(HPMPCpp,HPMPApp)。