1,1'-Carbonyldiimidazole → 5-Acetylthiophene-2-carboxylic acid (2-amino-3-carbamoylphenyl)amide

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-acetylthiophene-2-carboxylic acid (1.80 g, 10.55 mmol) in pyridine (12 mL) and N,N-dimethylformamide (12 mL) was added 1,1′-carbonyldiimidazole (1.88 g, 11.60 mmol) and the mixture stirred at 45° C. for 4 hours. 2,3-Diaminobenzamide dihydrochloride (synthesized as described in U.S. Pat. No. 6,737,421, column 11, EXAMPLE 2, step (e), 2.36 g, 10.55 mmol) was added and the mixture was stirred at ambient temperature overnight. The reaction mixture was concentrated and the residue partitioned between ethyl acetate and water. The resulting yellow solid was collected by filtration, washed with water and ethyl acetate and dried to give the title compound (2.91 g, 91%). MS (APCI): 304 (M+1)+.

Provenance & Evidence