Ammonia → (2R,3R,4S,5R)-2-(2-amino-5,6-dichloro-benzimidazol-1-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol

HRID 724856

Reaktionsgleichung

Reaktionsgleichung von HRID 724856
Cl[C:2]1[N:6]([C@@H:7]2[O:19][C@H:18]([CH2:20][O:21]C(=O)C)[C@@H:13]([O:14]C(=O)C)[C@H:8]2[O:9]C(=O)C)[C:5]2[CH:25]=[C:26]([Cl:30])[C:27]([Cl:29])=[CH:28][C:4]=2[N:3]=1.[NH3:31]>CO>[NH2:31][C:2]1[N:6]([C@@H:7]2[O:19][C@H:18]([CH2:20][OH:21])[C@@H:13]([OH:14])[C@H:8]2[OH:9])[C:5]2[CH:25]=[C:26]([Cl:30])[C:27]([Cl:29])=[CH:28][C:4]=2[N:3]=1

Komponenten

4

Edukt 2

HCID 222Ammonia2×HCID 466019[(2R,3R,4R,5R)-3,4-diacetoxy-5-(2,5,6-trichlorobenzimidazol-1-yl)tetrahydrofuran-2-yl]methyl acetate

Produkt 1

HCID 466018(2R,3R,4S,5R)-2-(2-amino-5,6-dichloro-benzimidazol-1-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 887MethanolLösungsmittel

Versuchsvorschrift

2,5,6-Trichloro-1-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)benzimidazole (42, 0.48 g; I mmole) was dissolved in dry MeOH (10 ml). Liq. NH3 (10 ml) was added and the mixture heated in a steel bomb at 100° C. for 2 hr. This mixture was stirred at room temperature for 24 hr. Excess NH3 was allowed to evaporate and the solution evaporated to dryness, absorbed onto silica gel (2 g), and chromatographed on a silica gel column using silica gel (20 g; 60-200 mesh). Elution of the column with CH2 Cl2 :CH3OH (96:4) gave the desired compound 44 as the major nucleoside. Evaporation of the solvent and crystallization of the residue from EtOH gave 44 (0.02 g; yield 6.06%). mp. 145° C.; UV Imax. (MeOH): 259 (7941) and 301 (8348) nm; Imax (pH1): 215 (26000) and 292 (7520) nm; Imax (pH11): 257 (7967) and 298 (7107) nm. 1H NMR(DMSO-d6): d 8.70 (s,1H, C7 -H, 8.28(s,1H, C4 -H), 7.90 (bs,2H, D2O exchangeable, NH2), 6.75(d,C1'H, J1,2 =4.5 Hz) and the rest of the sugar protons.

Aufarbeitung

  1. customto evaporate
  2. customthe solution evaporated to dryness
  3. customabsorbed onto silica gel (2 g)
  4. customchromatographed on a silica gel column
  5. washElution of the column with CH2 Cl2 :CH3OH (96:4)

Quellen und Nachweise

ORD-Eintrag
ord-f8f424d1eb4242b2bcdc88c4ac9730f2
Quelldatensatz
uspto-grants-1998_01
Patentnummer
US05705490

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