Hydrochloric Acid → N-(3-amidinophenyl)-N'-(4-amidinophenyl)cycloheptylurea

Participants

Reaction Steps

Dry hydrogen chloride gas was bubbled through an ice cooled solution of N-(3-cyanophenyl)-N'-(4-cyanophenyl)cycloheptylurea (0.065 g, 0.21 mmol) in anhydrous ethanol (5 ml) under a nitrogen atmosphere for 15 min. The reaction was stoppered and allowed to warm to ambient temperature and stir overnight. The reaction was concentrated in vacuo to give a white amorphous solid. This was dissolved in anhydrous ethanol (5 ml) and ammonium carbonate (0.118 g, 1.23 mmol) was added. The reaction was stirred under a nitrogen atmosphere at ambient temperature overnight. The reaction mixture was concentrated in vacuo to give a white solid. The product was purified by HPLC on a Vydec® C-18 column eluting with solvent mixture A (acetonitrile:water:TFA 80:20:0.3) and solvent mixture B (water:TFA 99.7:0.3) using a gradient starting with A:B at 3:97 and changing to A:B at 70:30 over 20 minutes. The major fraction was concentrated to give N-(3-amidinophenyl)-N'-(4-amidinophenyl)cycloheptylurea as a white solid (mp204-206° C.); LRMS (M+H)+ m/z 351, (M+2H)+2 m/z 176.2; HRMS calc. 351.1933, found 351.1936; 1H NMR (DMSO-d6): 9.4(bs, 2H), 9.2(broad s, 2H), 9.18 (broad s, 2H), 7.95 (broad s, 2H), 7.8-7.5(m, 6H), 7.47 (d, 2H), 3.9(bd, 4H), 1.83(m, 4H).

Provenance & Evidence