Triethylamine → HCID 57330211, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of methyl 3,5-diphenylpyridazine-4-carboxylic acid (compound 6) (200 mg, 0.72 mmol) in CH2Cl2 (10 mL), oxalyl chloride (230 mg, 1.81 mmol), catalytical DMF were added and stirred at 0° C. for 1 h. After the complete consumption of the acid shown by TLC, the volatiles were removed under reduced pressure and the crude acid chloride obtained was taken up in dry CH2Cl2 (5 mL). A solution of methyl amino hydrochloride (238 mg, 3.62 mmol) in CH2Cl2 (5 mL) cooled to 0° C., triethylamine (219 mg, 2.17 mmol) and acid chloride were added dropwise at 5° C. After the completion of the starting material, the reaction mixture was diluted with CH2Cl2 (20 mL), washed with aq NaHCO3 (5 mL×1), brine (5 mL×1) and dried over anhydrous Na2SO4. The combined organic extracts were evaporated under reduced pressure to obtain the crude product which was purified by column chromatography (100-200 mesh silica gel, 30% EtOAc in hexane) to furnish N-methyl-3,5-diphenylpyridazine-4-carboxamide (compound 1) (100 mg, 47%) as a light orange solid.

Provenance & Evidence