Synthesis and evaluation against hepatitis C virus of 7-deaza analogues of 2′-C-methyl-6-O-methyl guanosine nucleoside and l-Alanine ester phosphoramidates
作者:Claire Bourdin、Christopher McGuigan、Andrea Brancale、Stanley Chamberlain、John Vernachio、Jeff Hutchins、Elena Gorovits、Alexander Kolykhalov、Jerry Muhammad、Joseph Patti、Geoffrey Henson、Blair Bleiman、K. Dawn Bryant、Babita Ganguly、Damound Hunley、Aleksandr Obikhod、C. Robin Walters、Jin Wang、Changalvala V.S. Ramamurty、Srinivas K. Battina、C. Srivinas Rao
DOI:10.1016/j.bmcl.2012.12.004
日期:2013.4
HCV inhibitors now in clinical trials. In this Letter, we report the synthesis and biological evaluation of 2′-C-methyl-6-O-methyl-7-deaza guanosine and ProTide derivatives. In contrast to prior studies, removal of the N-7 of the nucleobase entirely negates anti-HCV activity compared to the 2′-C-methyl-6-O-methylguanosine analogues. To understand better this significant loss of activity, enzymatic assays
已知7-脱氮嘌呤具有广泛的抗病毒活性,但是2'- C-甲基鸟苷类似物显示差的细胞渗透和有限的磷酸化,因此不是丙型肝炎病毒(HCV)复制的有效抑制剂。我们先前曾报道6- O-甲基实体作为增加鸟嘌呤核苷亲脂性的前药部分,并且ProTide方法应用于2' - C-甲基-6- O-甲基鸟苷已导致有效的HCV抑制剂正在临床试验中。在这封信中,我们报告了2'- C-甲基-6- O的合成和生物学评价-甲基-7-脱氮鸟苷和ProTide衍生物。与先前的研究相反,与2' - C-甲基-6- O-甲基鸟苷类似物相比,去除核碱基的N-7完全消除了抗HCV活性。为了更好地了解这种显着的活性丧失,进行了酶促测定和分子建模,结果表明2'- C-甲基-6- O-甲基-7-脱氮鸟苷和相关ProTides不能充当游离核苷酸的有效前药,与亲代鸟嘌呤类似物的情况形成鲜明对比。