反应详情

1-(3-Azido-2,3-dideoxy-β-D-erythro-pentofuranosyl)-5-methyl-2(1H)-pyrimidinone (0.4 g, 1.59 mMol) was dissolved in dry pyridine (10 mL) at 0° C. under a nitrogen atmosphere. Pivaloyl chloride (0.588 mL; 4.78 mMol) was added with stirring and allowed to react for 72 hours. The reaction was quenched with ice then evaporated to dryness. The residue was chromatographed on silica gel eluted with 20:1 CHCl3 /MeOH (v/v) and the appropriate fractions combined and evaporated to give the title compound: mp =121°-123° C.; UV (nm): at pH 1λmax =327 (ε=5900), λmin =269 (ε=820); at pH 13λmax =322 (ε=17200), λmin =251 (ε=850); 1H NMR: (DMSO-d6) δ8.48(d, J=3.12 Hz, 1H, H4), 7.88(d, J=3.27 Hz, 1H, H6), 6.02(t, J=6.25 Hz, 1H, H1 '), 4.48-4.39(m, 1H, H3 '), 4.31-4.28(m, 2H, H5 '), 4.20-4.14(m, 1H, H4 '), 2.62-2.50(m, 1H, H2 '), 2.41-2.27(m, 1H, H2 '), 2.04(s, 3H, 5-CH3), 1.12(s, 9H, -C(CH3)3).

1. customto react for 72 hours
2. customThe reaction was quenched with ice
3. customthen evaporated to dryness
4. customThe residue was chromatographed on silica gel
5. washeluted with 20:1 CHCl3 /MeOH (v/v)
6. customevaporated