Synthesis and antiviral activities of fluorinated acyclic nucleoside phosphonates
作者:Wei Chen、Michael T. Flavin、Robert Filler、Ze-Qi Xu
DOI:10.1039/a805929b
日期:——
Novel α-fluoro derivatives of PME and HPMP were synthesized by electrophilic fluorination of 1-tert-butyldimethylsiloxy-2-[(diethoxyphosphoryl)methoxy]ethane 15 and 3-O-benzyl-2-O-[(diethoxyphosphoryl)methyl]-1-O-(tert-butyldimethylsiloxy)glycerol 22, respectively. The first series of acyclic nucleoside phosphonates possessing the α-fluoro(phosphoryl)methoxy group were prepared by coupling of F-PME or F-HPMP derivatives 18, 26, or 27 with the corresponding purine or pyrimidine nucleic bases under either modified Mitsunobu conditions or base-catalyzed alkylation conditions. Treatment of the diesters of F-PMEA 25a–c, F-PMEG 25f and F-PMEC 25g with concentrated aqueous ammonia led to the formation of the corresponding monoammonium salts of monoethyl phosphonate 30a, 30d, 30f and 30g. The synthesized fluorinated acyclic nucleoside phosphonates were tested against herpes viruses, respiratory viruses, hepatitis B virus and HIV. The monoammonium salt of the monoethyl ester of F-PMEA 30a was found to be active against human cytomegalovirus (HCMV), Epstein–Barr virus and measles with EC50 values of 5.6, 1.6 and 32 µg mL–1, respectively.
合成了新的α-氟衍生物PME和HPMP,具体通过电亲核氟化反应将1-叔丁基二甲基硅氧基-2-[(二乙氧基磷酸基)甲氧基]乙烷15和3-O-苄基-2-O-[(二乙氧基磷酸基)甲基]-1-O-(叔丁基二甲基硅氧基)甘油22进行合成。第一系列具有α-氟(磷酸基)甲氧基基团的非环状核苷酸磷酸酯是通过F-PME或F-HPMP衍生物18、26或27与相应的嘌呤或嘧啶核酸碱基在修改的Mitsunobu条件或碱催化烷基化条件下偶联制备的。对F-PMEA 25a-c、F-PMEG 25f和F-PMEC 25g的二酯与浓氨水处理后,形成了相应的单乙基磷酸盐30a、30d、30f和30g的单铵盐。合成的氟化非环状核苷酸磷酸酯经过了对抗单纯疱疹病毒、呼吸道病毒、乙型肝炎病毒和HIV的测试。F-PMEA的单乙基酯单铵盐30a显示出对人细胞巨病毒(HCMV)、埃博拉病毒和麻疹的活性,其EC50值分别为5.6、1.6和32 µg mL–1。