phosphoramidate

Bemnifosbuvir hemisulfate (AT-527) is a potent inhibitor of HCV virus replication.

Bemnifosbuvir (AT-511), a novel phosphoramidate prodrug of 2'-fluoro-2'-C-methylguanosine-5'-monophosphate, exhibits potent in vitro activity against HCV.

Adenosine 5′-monophosphoramidate sodium is a derivative of adenosine used as an intermediate for nucleotide synthesis. It significantly influences the accumulation of cyclic AMP.

Tetraethyl butane- 1, 4- diylbis(phosphoramid ate) is an alkyl chain-based PROTAC linker that can be used in the synthesis of PROTACs[1].

CTT2274 is a prodrug of MMAE. It consists of a prostate-specific membrane antigen (PSMA) binding scaffold, a biphenyl motif, a pH-sensitive phosphoramidate linker, and an MMAE payload. CTT2274 selectively targets and binds to PSMA to deliver MMAE and has the capability to inhibit prostate cancer.

NHC-diphosphate, a phosphorylated intracellular metabolite of β-d-N4-Hydroxycytidine (NHC) in its diphosphate form[1], serves as a potent antiviral agent. As a pyrimidine ribonucleoside, NHC effectively counters the replication of Venezuelan equine encephalitis virus (VEEV), Chikungunya virus (CHIKV), and hepatitis C virus (HCV)[1].

NHC-triphosphate triammonium is an active phosphorylated intracellular metabolite of β-d-N4-Hydroxycytidine (NHC) as a triphosphate form[1]. NHC-triphosphate triammonium is a weak alternative substrate for the viral polymerase and can be incorporated into HCV replicon RNA[1][2]. In an intracellular metabolism assay, HCV replicon cells are treated with 10 μM 3H-labeled NHC, and intracellular nucleotide levels are determined after 1, 2 and 8 hours incubations. NHC is rapidly convered into the mono-, di-, and triphosphate forms, and NHC-TP reaches up to 71.12 pM after 8 hours[1].NHC-triphosphate triammonium (NHC-TP) (5-40 μM) absence leads to full-length polymerization products, it can be a weak alternative substrate. In addition, incorporation of NHC-TP instead of CTP increases the molecular weight of the polymerization product by 16 (one extra oxygen) for each event and an obvious electrophoretic shift is observed in cell-free HCV NS5B polymerization reactions[1].Huh-7 cells are incubated with (10-50 μM; 4 h) NHC or a McGuigan phosphoramidate prodrug of NHC. Intracellular levels of the parental compounds and phosphorylated metabolites are measured using LC-MS/MS. Small amounts of NHC-monophosphate (MP) and NHC-diphosphate (DP) can be observed, while NHC-triphosphate triammonium remains the most abundant metabolite[2].NHC-triphosphate triammonium (NHC-TP) metabolite may directly target the viral polymerase and behave as a nonobligate chain terminator. It plays a prominent role in inhibiting early negative-strand RNA synthesis, either through chain termination or mutagenesis, which may in turn interfere with correct replicase complex formation. [1]. Stuyver LJ,et al. Ribonucleoside analogue that blocks replication of bovine viral diarrhea and hepatitis C viruses in culture.Antimicrob Agents Chemother. 2003 Jan;47(1):244-54. [2]. Maryam Ehteshami, et al. Characterization of β-d- N4-Hydroxycytidine as a Novel Inhibitor of Chikungunya Virus.

Anti-virus agent 1 (compound 4i), a phosphoramidate prodrug of GS-5734, exhibits potent antiviral efficacy and is primarily utilized in coronavirus and Ebola virus (EBOV) research.