2'Fluoro-2'-deoxyuridine → 5,6-Dichloro-1-(2-deoxy-2-fluoro-beta-D-ribofuranosyl)benzimidazole

Temperatur

80 °C

2'-Deoxy-2'-fluorouridine, compound 13 (0.99 g, 4 mmol), which can be prepared by the method of Codington et al. (Codington et al., 1968), was dissolved in 800 mL of 50 mM pH 6.0 citrate buffer. 5,6-dichlorobenzimidazole, compound 14 (0.30g, 1.6 mmoles), which can be prepared by the method of Townsend et al. (Townsend et al., 1970), was added and the reaction was placed in a 50° C. water bath. N-deoxyribo-furanosyl transferase (60,000 units; see Cook et al., 1990) was added and the reaction mixture was gently shaken overnight. 5,6-dichlorobenzimidazole, compound 14 (0.30 g, 1.6 mmoles) was added and the reaction continued for 2 days. The enzyme was precipitated by heating to 80° C. followed by cooling to room temperature. Celite® (50-60 g) was added and the reaction mixture filtered. The product was extracted with ethyl acetate (3×). The ethyl acetate was removed in vacuo and the residue purified by chromatography on 75 g of basic alumina eluted with chloroform/methanol (95:5, v/v) followed by (9:1, v/v), then (2:1, v/v), and finally (1:1, v/v). The product containing fractions were combined and the solvents removed in vacuo to give 0.54 g (67%) of compound 15.

1. additionwas added
2. customwas placed in a 50° C.
3. additionN-deoxyribo-furanosyl transferase (60,000 units; see Cook et al., 1990) was added
4. waitthe reaction continued for 2 days
5. customThe enzyme was precipitated
6. temperatureby cooling to room temperature
7. additionCelite® (50-60 g) was added
8. filtrationthe reaction mixture filtered
9. extractionThe product was extracted with ethyl acetate (3×)
10. customThe ethyl acetate was removed in vacuo
11. customthe residue purified by chromatography on 75 g of basic alumina
12. washeluted with chloroform/methanol (95:5
13. additionThe product containing fractions
14. customthe solvents removed in vacuo

ORD-Eintrag

ord-a8db238572a74333acdcc02875b00c34

Quelldatensatz

uspto-grants-1998_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05840743