Fluorocarbocyclic nucleosides: synthesis and antiviral activity of 2'- and 6'-fluorocarbocyclic 2'-deoxyguanosines
摘要:
A series of four isomeric 2'- and 6'-fluorocarbocyclic guanosine analogues have been prepared and evaluated as potential anti-herpes agents. The racemic 2'-beta-fluoro isomer 2-amino-1,9-dihydro-9-[(1-alpha, 2-alpha, 3-beta, 4-alpha)-2-fluoro-3-hydroxy-4-(hydroxymethyl)cyclopenty]-6H-purin-6-one (11a, C-AFG) and its 2'-alpha-fluoro epimer 11b plus the chiral 6'-beta-fluoro isomer 2-amino-1,9-dihydro-9-[[1S-(1-alpha, 2-alpha, 3-alpha, 4-beta)]-2-fluoro-4-hydroxy-3-(hydroxymethyl)cyclopentyl]-6H-purin-6-one (11c) and its 6'-alpha-fluoro epimer 11d were prepared from their respective fluoro amino diol hydrochlorides (6a,d). For comparison, the furanosyl compound 9-(2'-deoxy-2'-fluoro-beta-D-arabinofuranosyl)guanine (17, AFG) was prepared by coupling 2-amino-6-chloropurine with 2-deoxy-2-fluoro-3,5-di-O-benzoyl-alpha-D-arabinofuranosyl bromide followed by base hydrolysis. The 6'-alpha-fluoro derivative 11d exhibited comparable activity to that of acyclovir (ACV) against herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) in vitro but was > 30-fold more active than ACV against HSV-1 and HSV-2 in vivo in the mouse systemic model. The 2'-beta-fluoro derivative (11a, C-AFG) was extremely potent in vitro against HSV-1 and HSV-2 (ID50 0.006 and 0.05-mu-g/mL) and in vivo it was greater than 2 orders of magnitude more potent than ACV against HSV-1 and 70-fold more potent against HSV-2. The 2'-alpha-fluoro 11b and 6'-beta-fluoro 11c isomers were much less active.
Syntheses of 2′-deoxy-2′-fluoro-β-d-arabinofuranosyl purine nucleosides via selective glycosylation reactions of potassium salts of purine derivatives with the glycosyl bromide
作者:Grigorii G. Sivets
DOI:10.1016/j.tetlet.2015.11.091
日期:2016.1
Syntheses of 9-(2-deoxy-2-fluoro-β-d-arabinofuranosyl)-guanine (1) and -adenine (2) were accomplished from readily available 1,3,5-tri-O-benzoyl-2-deoxy-2-fluoro-α-d-arabinofuranose (3). A new and efficient approach for the synthesis of 1-α-bromide was developed using the mild bromination of α-1-O-benzoate (3). Selective coupling reactions of the bromosugar with purine potassium salts followed by derivatization/and
Chemistry and Anti-HIV Activity of 2′-β-Fluoro-2′,3′-dideoxyguanosine
作者:Harry Ford、John S. Driscoll、Maqbool Siddiqui、James A. Kelley、Hioraki Mitsuya、Takuma Shirasaka、David G. Johns、Victor E. Marquez
DOI:10.1080/15257779408013236
日期:1994.3
The 2'-beta-fluoro analogue of 2',3'-dideoxyguanosine has been prepared by two synthetic routes. This compound and two analogues have anti-HIV activity in at least two of three host cell systems used (ATH8, CEM, PEL). These compounds, as well as their ddGuo parents, have been characterized with regard to their acid-stabilities, octanol-water partition coefficients, and enzyme substrate properties for adenosine deaminase and purine nucleoside phosphorylase. F-ddGuo analogues are less potent but more stable than their non-fluorinated parent compounds.