Acetonitrile → HCID 86640484, Verbindung

(2R,3R,4R,5R)-5-(2-Amino-6-azetidin-1-yl -purin-9-yl)-4-fluoro-2-hydroxymethyl-4-methyl-tetrahydro-furan-3-ol (14, 340 mg, 1.0 mmol) was dissolved in anhydrous pyridine (6 ml) at ambient temperature. A solution of 0.45 M 1H -tetrazole in acetonitrile (5.5 mL, 2.5 mmol) was added followed by bis (N,N-diisopropylamino)methylphosphoramidite (317 μL, 1.1 mmol). The mixture was stirred at ambient temperature for 17 h. The solvent was concentrated under reduced pressure and the residue was triturated with ethyl acetate (20 mL). The resulting precipitant of salts was removed by filtration and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography using a gradient of ethyl acetate in hexanes (40-80%). The product containing fractions were combined and concentrated to a white solid, 47 mg (12% yield).

1. concentrationThe solvent was concentrated under reduced pressure
2. customthe residue was triturated with ethyl acetate (20 mL)
3. customThe resulting precipitant of salts was removed by filtration
4. concentrationthe filtrate was concentrated under reduced pressure
5. customThe residue was purified by silica gel column chromatography
6. additionThe product containing fractions
7. concentrationconcentrated to a white solid, 47 mg (12% yield)

ORD-Eintrag

ord-2b3fd76ae1d94718977b5e8e483c2f30

Quelldatensatz

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08173621B2