RESUMEN
The synthesis of constrained nucleosides has become an important tool to understand the SAR in the interaction between biological and synthetic nucleotides in the context of antisense oligonucleotide therapy. The incorporation of a cyclopropane into a furanose ring of a nucleoside induces some degree of constrain without affecting significantly the steric environment of a nucleoside. Here, we report a new, short and stereocontrolled synthesis of two constrained nucleosides analogues, 1',2'- methano-2',3'-dideoxyuridine 9, and the corresponding cytidine analog 12. X-ray crystallography revealed that the furanose ring in the constrained uridine and cytidine analogues was flattened with virtual loss of pseudorotation. The phosphoramidate esters of the novel constrained uridine and cytidine nucleosides, intended as prodrugs, were tested in cell-based assays for viral replication across the herpes virus family and HIV inhibition courtesy of Merck laboratories, Rahway. They were also tested in antiproliferative assays against colorectal and melanoma cell lines. Unfortunately, none of the compounds showed activity in these assays.
Asunto(s)
Antivirales/síntesis química , Antivirales/farmacología , Didesoxinucleósidos/síntesis química , Didesoxinucleósidos/farmacología , Línea Celular Tumoral , Cristalografía por Rayos X , Didesoxinucleósidos/química , Ensayos de Selección de Medicamentos Antitumorales , VIH/efectos de los fármacos , VIH/fisiología , Herpesviridae/efectos de los fármacos , Herpesviridae/fisiología , Humanos , Relación Estructura-Actividad , Replicación Viral/efectos de los fármacosRESUMEN
The anticancer nucleoside 5-fluoro 2'-deoxyuridine-5'-phosphate (5-FdU-P) was attached via an amide chain linker to a triantennary GalNAc cluster as a means to deliver the drug to hepatic cells that recognize the amino sugar units.