A Novel Class of Phosphonate Nucleosides. 9-[(1-Phosphonomethoxycyclopropyl)methyl]guanine as a Potent and Selective Anti-HBV Agent
作者:Jong-Ryoo Choi、Dong-Gyu Cho、Kee Y. Roh、Jae-Taeg Hwang、Sinbyoung Ahn、Hyun S. Jang、Woo-Young Cho、Kyong W. Kim、Young-Gyo Cho、Jeongmin Kim、Yong-Zu Kim
DOI:10.1021/jm0305265
日期:2004.5.1
9-[1-(Phosphonomethoxycyclopropyl)methyl]guanine (PMCG, 1), representative of a novel class of phosphonate nucleosides, blocks HBV replication with excellent potency (EC50 = 0.5 muM) in a primary culture of HepG2 2.2.15 cells. It exhibits no significant cytotoxicity in several human cell lines up to 1.0 mM. It does not inhibit replication of human immunodeficiency virus (HIV-1) or herpes simplex virus (HSV-1) at 30 muM. Many purine base analogues of 1 also exhibit inhibitory activity against HBV, but at 30 muM, pyrimidine analogues do not. 1 is 4 times more potent than 9- [2-(phosphonomethoxy)ethyl] adenine (PMEA), which was used as a positive control (EC50 = 2.0 muM). The characteristic cyclopropyl moiety at the 2'-position of 1 was prepared by titanium-mediated Kulinkovich cyclopropanation. 1 was modified to give the orally available drug candidate, PMCDG Dipivoxil (2). Compound 2 exhibited excellent efficacy when administered at 5 mg per kg per day in a study with woodchucks infected with woodchuck hepatitis B virus (WHBV). Drug candidate 2 has successfully completed phase I clinical trials and is currently undergoing phase II clinical studies for evaluation of efficacy.