9-{[3-Fluoro-2-(hydroxymethyl)cyclopropylidene]methyl}adenines and -guanines. Synthesis and Antiviral Activity of All Stereoisomers
作者:Shaoman Zhou、Earl R. Kern、Elizabeth Gullen、Yung-Chi Cheng、John C. Drach、Sadahiro Tamiya、Hiroaki Mitsuya、Jiri Zemlicka
DOI:10.1021/jm0607404
日期:2006.10.1
All stereoisomers of adenine and guanine methylene-3-fluoromethylenecyclopropane analogues of nucleosides 9a, 9b, 10a, 10b, 11a, 11b, 12a, and 12b were synthesized and their antiviral activities were evaluated. A highly convergent approach permitted the synthesis of all these analogues using a single intermediate 15. Reaction of aldehyde 13 with fluorotrichloromethane and tri-n-butylphosphine gave
合成了核苷9a,9b,10a,10b,11a,11b,12a和12b的所有腺嘌呤和鸟嘌呤亚甲基-3-氟亚甲基环丙烷类似物的立体异构体,并评估了它们的抗病毒活性。高度收敛的方法允许使用单一的中间体15合成所有这些类似物。醛13与氟代三氯甲烷和三正丁基膦反应,得到氟代烯烃14a + 14b(83:17)。加入衍生自重氮乙酸乙酯的卡宾,得到环丙烷15,为主要产物。还原(19),溴化(20)和苯硒基化(21),然后进行Se氧化和β-消除,得到顺式-亚甲基环丙烷22。溴的加入提供了用于烷基化消除的试剂23。23与腺嘌呤的反应产生异构体混合物25a + 26a,其在脱保护后得到类似物9a和10a。2-氨基-6-氯嘌呤提供25e + 26e,解封后(9e和10e)并水解得到目标9b和10b。中间体15在脱苄基作用(27),2-硝基苯基硒烯基化(28),还原(29),苄基化(30)和氧化消除反式亚甲基环丙