1-Propanol → HCID 131723497, compound

Participants

Reaction Steps

(±)-(1R*,2S*,3R*)-3-(4,5-Dichloro-2-nitroanilino)-1,2-cyclohexanediyl diacetate (part a of this example, 5.65 g, 13.9 mmol) in n-propanol (250 ml) was shaken with Raney nickel (Aldrich, ca. 0.50 g) under hydrogen (50 psi) for 2 h. Filtration through Celite and evaporation of solvent left the 5,6-diaminobenzimidazole intermediate. Triethylorthoformate (250 ml) and 4 drops of methanesulfonic acid were added and the solution stirred at room temperature for 2 days. Volatiles were evaporated in vacuo and the residual material chromatographed on silica gel. Title compound eluted with 2% methanol-ethyl acetate as off-white solid (1.87 g, 35%), m.p. 163-165° C. Anal. Calcd. for C17H18Cl2N2O4: C, 53.00; H, 4.71; N, 7.27; Cl, 18.41. Found: C, 52.85; H, 4.72; N, 7.17; Cl, 18.35.

Provenance & Evidence