Sodium Hydroxide → HCID 54275484, compound

Participants

Reaction Steps

(±)(1R*, 2S*, 3R*, 5R*)-3-(Acetoxymethyl)-5-(2-bromo-5,6-dichloro-1H-benzimidazol-1-yl)-1,2-cyclopentanediyl diacetate (Example 39, 1.00 g, 1.87 mmol), cyclopropylamine (Aldrich, 1.7 mL, 24 mmol) and absolute ethanol (10 mL) were refluxed under nitrogen for 48 hours. The reaction was cooled and 1 N sodium hydroxide (1.2 mL) was added. Volatiles were evaporated in vacuo and the residual oily solid was chromatographed on silica gel. Elution with 5% methanol--ethyl acetate gave fractions containing white powder (200 mg). Recrystallization from 1:1 water-ethanol gave (±)-(1R*, 2S*, 3R*, 5R*)-5-[5,6-dichloro-2-(cyclopropylamino)-1H-benzimidazol-1-yl]-3-(hydroxymethyl)-1,2-cyclopentanediol as white crystals (180 mg, 40%); m.p. >250° C.; 1H-NMR(DMSO-d6)δ 7.70 (m, 1, NH), 7.62 and 7.39 (both s, 1 each, 2 benzimidazole CH), 5.77 (br s, 1, OH), 5.13 (d, J=5.3 Hz, 1, OH), 4.95-4.80 (m, 1, CHN), 4.48 (t, J=4.7 Hz, 1, CH2OH), 4.2-4.0 (m, 2, 2 OCH), 3.7-4.0 (m, 2, OCH2), 2.9-2.65 (m, 1, OCH), 2.2-1.8 (m, 3, CH2 and CH); mass spectrum (CI): 372(M+1). [See Examples 10-14]

Provenance & Evidence