Trifluoroacetic acid → (2S)-(2R,3S,4R,5R)-2-((((((2R,3S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-2-((phosphonooxy)methyl)tetrahydrofuran-3-yl)oxy)(hydroxy)phosphoryl)oxy)methyl)-5-(6-amino-9H-purin-9-yl)-4-hydroxytetrahydrofuran-3-yl 2-amino-5-azido-4-(isopropyldisulfanyl)pentanoate

Participants

Reaction Steps

Trifluoroacetic acid (0.1 mL) was added to a solution of (2S)-(2R,3S,4R,5R)-2-((((((2R,3S,5R)-5-(4-amino-2-oxopyrimidine-1(2H)-yl)-2-((phosphonooxy)methyl)tetrahydrofuran-3-yl)oxy)(hydroxy)phosphoryl)oxy)methyl)-5-(6-amino-9H-purin-9-yl)-4-hydroxytetrahydrofuran-3-yl 5-azido-2-((tert-butoxycarbonyl)amino)-4-(isopropyldisulfanyl)pentanoate (Compound 46) (27.7 mg, 28 μmol) in dichloromethane (0.4 mL), and the mixture was stirred for 35 minutes at room temperature. Following concentration under reduced pressure, the resulting residue was purified by reverse-phase silica gel column chromatography (0.05% aqueous trifluoroacetic acid solution/0.05% trifluoroacetic acid-acetonitrile solution) to afford (2S)-(2R,3S,4R,5R)-2-((((((2R,3S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-2-((phosphonooxy)methyl)tetrahydrofuran-3-yl)oxy)(hydroxy)phosphoryl)oxy)methyl)-5-(6-amino-9H-purin-9-yl)-4-hydroxytetrahydrofuran-3-yl 2-amino-5-azido-4-(isopropyldisulfanyl)pentanoate (Orn(N3) (4-SSiPr)-pdCpA) (Compound 47) (21.5 mg, 86%).

Provenance & Evidence