Phenol → HCID 57087935, compound

Participants

Reaction Conditions

Reaction Steps

Phenol (72 mg, 0.77 mmol) and anhydrous potassium carbonate (106 mg, 0.77 mmol) were stirred in dry N,N-dimethylformamide (5 mL) under nitrogen for 1.0 hour. (±)(1R*,2S*,3S*,5S*)-3-(Acetoxymethyl)-5-(2-bromo-5,6-dichloro-1H-benzimidazol-1-yl)-1,2-cyclopentanediyl diacetate (400 mg, 0.770 mmol) was added and the mixture stirred at 80° C. (oil bath) for 18 hours. Volatiles were removed in vacuo and the residue partitioned between chloroform and water. The chloroform layer was dried (sodium sulfate) and volatiles evaporated. The residual oil was stirred in 4N ammonia in methanol (30 mL) at ambient temperature for 18 hours. Evaporation and chromatography of the residue on silica gel with elution by 2% methanol-chloroform gave (±)-(1R*,2S*,3S*,5S*)-5-(5,6-dichloro-2-phenoxy-1H-benzimidazol-1-yl)-3-(hydroxymethyl)-1,2-cyclopentanediol as white solid foam from ethyl acetate (215 mg, 68%); 1H-NMR(DMSO-d6) δ: 7.98 and 7.71 (both s, 2, aromatic CH), 7.6-7.3 (m, 5, C6H5), 5.07 (d, J=6.4 Hz, 1, OH), 5.0-4.75 (m overlapping t at 4.95, J=3.1 Hz, total 2, NCH and OH), 4.71 (d, J=3.9 Hz, 1, OH), 4.5-4.35 (m, 1, OCH), 3.9-3.8 (m, 1, OCH), 3.7-3.4 (m, 2, OCH2), 2.3-1.9 (m, 3, CH2 and CH); mass spectrum (CI): 409 (M+1).

Provenance & Evidence