2,5,6-trichloro-1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl]indole-3-carbonitrile → methyl 2,5,6-trichloro-1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl]indole-3-carboximidate

HRID 28355Notes

Reaction equation

HRID 28355 reaction equation
[Cl:1][C:2]1[N:3]([C@@H:15]2[O:21][C@H:20]([CH2:22][OH:23])[C@@H:18]([OH:19])[C@H:16]2[OH:17])[C:4]2[C:9]([C:10]=1[C:11]#[N:12])=[CH:8][C:7]([Cl:13])=[C:6]([Cl:14])[CH:5]=2.[CH3:24][OH:25].O>CO.CN(C=O)C>[Cl:1][C:2]1[N:3]([C@@H:15]2[O:21][C@H:20]([CH2:22][OH:23])[C@@H:18]([OH:19])[C@H:16]2[OH:17])[C:4]2[C:9]([C:10]=1[C:11](=[NH:12])[O:25][CH3:24])=[CH:8][C:7]([Cl:13])=[C:6]([Cl:14])[CH:5]=2

Participants

5

Reactant 2

HCID 30125652,5,6-trichloro-1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl]indole-3-carbonitrileHCID 22242641Methanol--water (1/1)

Product 1

HCID 3012575methyl 2,5,6-trichloro-1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl]indole-3-carboximidateYield 58%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 6228DimethylformamideSolvent

Procedure

2,5,6-Trichloro-3-cyano-1-(β-D-ribofuranosyl)indole (4.4, 107 mg, 0.28 mmol) was dissolved in dry MeOH (10 mL) which was cooled to 0 C in an ice bath. Hydrogen chloride gas was slowly bubbled through the solution for 2 h, then the reaction vessel was tightly capped, and the resulting solution was stirred at room temperature for 24 h. The acidic solution was diluted with Et2O (20 mL) and evaporated to dryness. The residual solid was suspended in 10% aqueous NaHCO3 (100 mL) and extracted with EtOAc (3×100 mL, with vigorous shaking). The combined organic extracts were dried over MgSO4, filtered and evaporated to yield a white solid which was dissolved in DMF (0.5 mL) and subjected to column chromatography (40×350 mm) on C18-reverse phase silica gel with 75% MeOH/H2O. Fractions containing product were pooled and evaporated to yield 64 mg (58%) of 4.34 as a white crystalline solid: mp 248-249 C; Rf 0.6 (20% MeOH/CHCl3); 1H-NMR (500 MHz, DMSO-d6): δ 8.55 (s, 1H), 8.43 (s, 1H, D2O exch.), 7.96 (s, 1H), 5.98 (d, 1H), 5.39 (d, 1H, D2O exch.), 5.37 (t, 1H, D2O exch.), 5.24 (d, 1H, D2O exch.), 4.41 (q, 1H), 4.14 (s, 1H), 3.98 (d, 1H), 3.85 (s, 3H), 3.71 (m, 2H). 13C-NMR (125 MHz, DMSO-d6): δ 161.40, 132.01, 128.23, 125.67, 124.82, 124.50, 121.32, 115.19, 106.29, 88.73, 86.08, 71.40, 69.50, 60.99, 52.45. HRMS (EI) m/z calcd. for C15H15Cl3N2O5 408.0047, found 408.0043. Anal calcd for C15H15Cl3N2O5: C, 43.98; H, 3.69; N, 6.84. Found: C, 43.97; H, 3.81; N, 6.75.

Workup

  1. temperaturewas cooled to 0 C in an ice bath
  2. customHydrogen chloride gas was slowly bubbled through the solution for 2 h
  3. customthe reaction vessel was tightly capped
  4. additionThe acidic solution was diluted with Et2O (20 mL)
  5. customevaporated to dryness
  6. extractionextracted with EtOAc (3×100 mL, with vigorous shaking)
  7. dry with materialThe combined organic extracts were dried over MgSO4
  8. filtrationfiltered
  9. customevaporated
  10. customto yield a white solid which
  11. additionFractions containing product
  12. customevaporated

Sources & evidence

ORD record
ord-d84050a68e254ea09ab82bb306c67cb8
Source dataset
uspto-grants-2008_09
Patent number
US07419963B2

Reaction notes

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