Reaktion #1951034

Reaktionsgleichung

2,5,6-Trichloro-3-(2-furyl)-1-(3,5-di-O-toluoyl-2-deoxy-β-D-ribofuranosyl)indole

sodium methoxide

MeOH CHCl3

→

4.78

Ausbeute 75.6%

2,5,6-Trichloro-3-(2-furyl)-1-(2-deoxy-β-D-ribofuranosyl)indole

Ausbeute 75.6%

Lösungsmittel

MeOH

CHCl3

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.DISSOLUTIONwere completely dissolved
2. 2
   SonstigeThe solvent was then removed under vacuum
3. 3
   ExtraktionThe aqueous suspension was extracted with EtOAc (2×50 mL)
4. 4
   Trocknenthe combined organic extracts were dried over MgSO4
5. 5
   Filtrationfiltered
6. 6
   Sonstigeevaporated
7. 7
   Sonstigeto yield a clear oil
8. 8
   workup.ADDITIONFractions containing product
9. 9
   Sonstigeevaporated
10. 10
    Sonstigeto yield a pale yellow solid which
11. 11
    Sonstigewas recrystallized from 10% MeOH/CHCl3 and hexane

Vorschrift

2,5,6-Trichloro-3-(2-furyl)-1-(3,5-di-O-toluoyl-2-deoxy-β-D-ribofuranosyl)indole (4.76, 142 mg, 0.22 mmol) was suspended in dry MeOH (10 mL) to which was added sodium methoxide (30 mg, 0.56 mmol). The suspension was stirred at room temperature for 45 min, until the solids were completely dissolved. The solvent was then removed under vacuum, and the residue suspended in brine (50 mL). The aqueous suspension was extracted with EtOAc (2×50 mL), and the combined organic extracts were dried over MgSO4, filtered and evaporated to yield a clear oil. The oil was dissolved in CHCl3 (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 pale yellow solid which was recrystallized from 10% MeOH/CHCl3 and hexane to yield 67 mg (75%) of 4.78 as a white crystalline solid: mp 140-141 C; Rf0.5 (10% MeOH/CHCl3); 1H-NMR (500 MHz, DMSO-d6): δ 8.46 (s, 1H), 8.14 (s, 1H), 7.86 (s, 1H), 6.88 (d, 1H), 6.68 (s, 1H), 6.47 (dd, 1H), 5.42 (d, 1H, D2O exch.), 5.23 (s, 1H, D2O exch.), 4.45 (d, 1H), 3.89 (d, 1H), 3.73 (s, 2H), 2.55 (m, 1H), 2.13 (m, 1H). 13C-NMR (125 MHz, DMSO-d6): δ 146.54, 142.25, 132.30, 125.61, 124.39, 124.09, 122.64, 120.75, 114.98, 111.51, 106.91, 104.87, 87.25, 85.04, 69.98, 60.91, 38.97. HRMS (EI) m/z calcd. for C17H14Cl3NO4 400.9988, found 400.9986. Anal calcd for C17H14Cl3NO4.¼H2O: C, 50.15; H, 3.59; N, 3.44. Found: C, 50.17; H, 3.65; N, 3.43.

Quelle