Reaction #1951031

Reaction equation

2,5,6-Trichloro-3-acetyl-1-(5-O-acetyl-β-D-ribofuranosyl)indole

sodium methoxide

→

4.46

Yield 81.3%

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

Yield 81.3%

Solvents

MeOH

Conditions

Workup

1. 1
   Otherthe solvent was then removed under vacuum
2. 2
   Extractionthe suspension extracted with EtOAc (2×50 mL)
3. 3
   DryingThe combined organic extracts were dried over MgSO4
4. 4
   Filtrationfiltered
5. 5
   Otherevaporated
6. 6
   Otherto yield a white solid
7. 7
   OtherThe solid was recrystallized

Procedure

2,5,6-Trichloro-3-acetyl-1-(5-O-acetyl-β-D-ribofuranosyl)indole (4.43, 232 mg, 0.53 mmol) was dissolved in dry MeOH (20 mL) to which was added sodium methoxide (35 mg, 0.65 mmol). The solution was stirred at room temperature for 45 min, and the solvent was then removed under vacuum. The residue was suspended in 10% aqueous NaHCO3 (50 mL) and the suspension extracted with EtOAc (2×50 mL). The combined organic extracts were dried over MgSO4, filtered and evaporated to yield a white solid. The solid was recrystallized from boiling EtOAc/hexane to yield 170 mg (81%) of 4.46 as a white crystalline solid: mp 249-250 C; Rf0.4 (10% MeOH/CHCl3); 1H-NMR (500 MHz, DMSO-d6): δ 8.63 (s, 1H), 8.41 (s, 1H), 6.07 (d, 1H), 5.45-5.42 (m, 2H, D2O exch.), 5.30 (d, 1H, D2O exch.), 4.44 (q, 1H), 4.17 (d, 1H), 4.03 (d, 1H), 3.75 (b, 2H), 2.63 (s, 3H). 13C-NMR (125 MHz, DMSO-d6): δ 192.17, 133.10, 132.38, 126.21, 126.00, 125.73, 122.00, 115.44, 112.99, 88.97, 86.39, 71.63, 69.54, 60.97, 30.72. HRMS (ES) m/z calcd. for C15H14C13NO5□Na 415.9835, found 415.9843. Anal calcd for C15H14Cl3NO5: C, 45.65; H, 3.58; N, 3.55. Found: C, 45.75; H, 3.78; N, 3.61.

Source