Quinone → HCID 178511944, compound

Participants

Reaction Conditions

Reaction Steps

Methyl [5′-tert-butylsulfamoyl-5-formyl-2′-methoxy-6-(2-methoxyethoxymethoxy)biphenyl-3-yl]acetate (0.496 g, 1.1 mmol), prepared as in Reference 8, was dissolved in methanol (20 mL) and the solution was charged with 3,4-diaminobenzamidine-HCl (1.25 mmol, 0.23 g) and 1,4-benzoquinone (1.25 mmol, 0.135 g). The mixture was refluxed for 2 hours and then concentrated by evaporation. This residue was taken up in trifluoroacetic acid (10 mL) and the mixture was stirred for 1 hour. Evaporation and further pumping down yielded a purple amorphous residue. Pyridine hydrochloride (5.0 g) was added and the reaction mixture was heated at 180° C. for 30 minutes. The mixture was cooled and a resulting solid was dissolved in 20 mL of preparative hplc sample solvent (20% acetonitrile/20 mmol HCl). The product was purified by preparative hplc (C-18, 2,2,25 acetonitrile). The fractions containing the pure product were collected and lyophilized to give [5-(5-carbamimidoyl-1H-benzoimidazol-2-yl)-6,2′-dihydroxy-5′-sulfamoylbiphenyl-3-yl]acetic acid (0.31 g, 59%). LCMS: Calcd 481.49; Obsd (MH+)=482.0, (MH−)=480.2. NMR (DMSO-d6) d 3.621 (s, 2H), 7.07 (d, J=8 Hz, 1H), 7.15 (br s, 2H), 7.27 (d, J=2 Hz, 1H), 7.63 (d, J=2 Hz, 1H), 7.65 (m, 2H), 7.73 (d of d, J=2, J=8 Hz, 1H), 7.83 (d, J=8 Hz, 1H), 8.08 (d, J=2 Hz, 1H), 8.17 (s, 1H), 9.10, 9.39 (2s, 4H).

Provenance & Evidence