Reaktion #47765

Reaktionsgleichung

81

5-Acetylamino-7-chloro-3-(2′,3′,5′-tri-O-acetyl-β-D-ribofuranosyl)-thiazolo[4,5-d]pyrimidin-2-one

sodium acetate

→

82

Ausbeute 90.2%

5-Acetylamino-3-(2′,3′,5′-tri-O-acetyl-β-D-ribofuranosyl)-thiazolo[4,5-d]pyrimidin-2-one

Ausbeute 90.2%

Lösungsmittel

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   FiltrationThe mixture was filtered through Celite®
2. 2
   Waschenwashed with ethyl acetate (200 mL)
3. 3
   Einengenconcentrated to a yellow solid
4. 4
   workup.ADDITIONThe mixture was diluted with H2O (200 mL)
5. 5
   Extraktionextracted with CH2Cl2 (3×100 mL)
6. 6
   TrocknenThe combined organic layers were dried (MgSO4)
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated
9. 9
   SonstigeThe residue was purified via Flash chromatography (SiO2, 10% Acetone-CHCl3)

Vorschrift

10% Palladium on carbon (862 mg) was added to a solution of 81 (2.07 mg, 4.12 mmol), sodium acetate (675 mg, 8.23 mmol) and absolute ethanol (100 mL) under nitrogen. The mixture was stirred under 250-300 psi H2 (g) in a bomb for a period of 48 h. The mixture was filtered through Celite®, washed with ethyl acetate (200 mL), and concentrated to a yellow solid. The mixture was diluted with H2O (200 mL) and extracted with CH2Cl2 (3×100 mL). The combined organic layers were dried (MgSO4), filtered, and concentrated. The residue was purified via Flash chromatography (SiO2, 10% Acetone-CHCl3) to afford 82 (1.74 g, 90%) as a white powder: 1H NMR (400 MHz, d6-DMSO) δ 10.78 (s, 1H), 8.82 (s, 1H), 6.10 (d, J=4.0 Hz, 1H), 6.04 (dd, J=6.0, 4.0 Hz, 1H), 5.77 (t, J=6.0 Hz, 1H), 4.41 (dd, J=11.6, 3.2 Hz, 1H), 4.30 (m, 1H), 4.23 (dd, J=12.0, 6.8 Hz, 1H), 2.20 (s, 3H), 2.12 (s, 3H), 2.10 (s, 3H), 2.03 (s, 3H); [M+H]+ 469.4.

Quelle