Reaktion #1951035

Reaktionsgleichung

MeOH CHCl3

3-Formyl-2,5,6-trichloro-1-[3,5-di-O-(p-toluoyl)-2-deoxy-β-D-ribofuranosyl]indole

sodium methoxide

→

4.114

Ausbeute 69.0%

5,6-Dichloro-2-methoxy-3-formyl-1-(2-deoxy-β-D-ribofuranosyl)indole

Ausbeute 69.0%

Lösungsmittel

MeOH

MeOH

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe solvent was then removed under vacuum
2. 2
   Extraktionextracted with EtOAc (2×100 mL)
3. 3
   WaschenThe combined organic extracts were washed with brine (25 mL)
4. 4
   Trocknendried over MgSO4
5. 5
   Filtrationfiltered
6. 6
   Sonstigeevaporated
7. 7
   Sonstigeto yield a damp solid
8. 8
   workup.ADDITIONFractions containing product
9. 9
   Sonstigeevaporated
10. 10
    Sonstigeto yield a white solid
11. 11
    SonstigeThe solid was recrystallized
12. 12
    Temperaturfrom warm MeOH

Vorschrift

3-Formyl-2,5,6-trichloro-1-[3,5-di-O-(p-toluoyl)-2-deoxy-β-D-ribofuranosyl]indole (4.113, 198 mg, 0.33 mmol) was suspended in dry MeOH (10 mL) to which was added sodium methoxide (75 mg, 1.4 mmol). The suspension was stirred at room temperature for 16 h, after which time the solution clarified. The solvent was then removed under vacuum, and the residue was suspended in water (50 mL), and extracted with EtOAc (2×100 mL). The combined organic extracts were washed with brine (25 mL), dried over MgSO4, filtered and evaporated to yield a damp solid. The crude material was dissolved in MeOH (1 mL) and subjected to column chromatography (40×350 mm) on silica gel with 10% MeOH/CHCl3. Fractions containing product were pooled and evaporated to yield a white solid. The solid was recrystallized from warm MeOH to yield 82 mg (68%) of 4.114 as a white crystalline solid: mp 186-187° C.; Rf0.3 (10% MeOH/CHCl3); 1H-NMR (500 MHz, DMSO-d6): δ 10.21 (s, 1H), 8.29 (s, 1H), 8.22 (s, 1H), 6.32 (dd, 1H), 5.37 (b, 1H, D2O exch.), 5.15 (b, 1H, D2O exch.), 4.43 (s, 3H), 4.41 (m, 1H), 3.83 (d, 1H), 3.68 (m, 2H), 2.53 (m, 1H), 2.11 (m, 1H). 13C-NMR (125 MHz, DMSO-d6): δ 183.22, 159.16, 129.40, 125.04, 124.73, 124.66, 121.11, 114.24, 100.02, 87.29, 82.99, 70.07, 64.16, 61.03, 38.43. HRMS (EI) m/z calcd. for C15H15Cl2NO5 359.0327, found 359.0320. Anal calcd for C15H15Cl2NO5.½H2O: C, 48.80; H, 4.37; N, 3.79. Found: C, 48.48; H, 4.61; N, 3.61.

Quelle