A novel method is provided for screening prodrugs of methoxyphosphonate nucleotide analogues to identify prodrugs selectively targeting desired tissues with antiviral or antitumor activity. This method has led to the identification of novel mixed ester-amidates of PMPA for retroviral or hepadnaviral therapy, including compounds of structure (5a) having substituent groups as defined herein. Compositions of these novel compounds in pharmaceutically acceptable excipients and their use in therapy and prophylaxis are provided. Also provided is an improved method for the use of magnesium alkoxide for the preparation of starting materials and compounds for use herein.
本发明提供了一种筛选甲氧基
磷酸酯核苷类似物的前药的新方法,以识别具有抗病毒或抗肿瘤活性并选择性靶向所需组织的前药。该方法已导致识别出
PMPA的新型混合酯-酰胺类前药,用于逆转录病毒或乙肝病毒治疗,包括具有如下所定义的取代基团的结构化合物(5a)。本发明还提供了这些新型化合物在药学上可接受的载体中的组成物以及它们在治疗和预防中的使用。此外,还提供了一种改进的
镁烷氧化物的使用方法,用于制备本文所述的起始材料和化合物。