Foscarnet

Foscarnet Sodium,AstraZeneca,USA

ChEBI: Phosphoric acid in which one of the hydroxy groups is replaced by a carboxylic acid group. It is used as the trisodium salt as an antiviral agent in the treatment of cytomegalovirus retinitis (CMV retinitis, an inflamation of the retina that can lead to bl ndness) and as an alternative to ganciclovir for AIDS patients who require concurrent antiretroviral therapy but are unable to tolerate ganciclovir due to haematological toxicity.

423 g (4.77 mol) of sodium hydroxide is added to 400 ml of water. The solution is heated to about 50°C and 167 g (0.795 mol) of triethyl phosphonoformate is added. The reaction mixture is then heated to about 90°C and ethanol formed is distilled off. After about 1 hour at 90-95°C the reaction mixture is cooled to about 20°C and the product is filtered off. The yield of trisodium phosphonoformate hexahydrate wet is 248 g.
The wet substance is recrystallized in 570 ml of water by heating to 423 g (4.77 mol) of sodium hydroxide liquid conc. is added to 400 ml of water. The solution is heated to about 50°C and 167 g (0.795 mol) of triethyl phosphonoformate is added at this temperature. The reaction mixture is then heated to about 90°C and ethanol formed is distilled off. After about 1 hour at 90-95°C the reaction mixture is cooled to about 20°C and the product is filtered off. The yield of trisodium phosphonoformate hexahydrate wet is 248 g.
The wet substance is recrystallized in 570 ml of water by heating to 90°C in order to obtain a clear solution and then cooling to about 20°C. After filtration and washing with 50 ml of water at 18-22°C 187 g (74% of theoretical yield) of trisodium phosphonoformate hexahydrate is obtained. This substance contains about 2% free water, which can be eliminated by drying.

Antiviral

This pyrophosphate analogue (FWtrisodium salt = 191.95 g/mol; CAS 4428-95- 9), also called foscarnet, exhibits antiherpetic activity. It is a stro+ng inhibitor of viral reverse transcriptases and viral replication as well as Na/phosphate cotransporters. Target (s) : adenylyl cyclase; avian myeloblastosis virus reverse transcriptase; cytomegalovirus DNA polymerase (4-6); DNA- directed DNA polymerase; DNA polymerase b; DNA polymerases, viral; duck hepatitis B virus reverse transcriptase ; Epstein-Barr virus DNA polymerase; equine infectious anemia virus reverse transcriptase; exoribonuclease H; feline immunodeficiency virus reverse transcriptase; geranyl-diphosphate cyclase, or bornyl-diphosphate synthase; guanylyl cyclase; HIV-1 reverse transcriptase; human T-lymphotropic virus type III reverse transcriptase; herpes virus reverse transcriptase ; human hepatitis B virus reverse transcripta+se; Moloney murine leukemia virus reverse transcriptase; Na-dependent phosphate transport (32-38); phosphoenolpyruvate carboxylase; phosphoenolpyruvate mutase; phosphonoacetate hydrolase; phosphonopyruvate hydrolase; ribonuclease H; RNA-directed DNA polymerase; simian immunodeficiency virus reverse transcriptase; and woodchuck hepatitis virus reverse transcriptase.