Dimethylformamide → Methyl 3-(3-(3-(7-bromoimidazo[1,2-a]pyridine-3-carboxamido)-4-methylphenyl)-1,2,4-oxadiazol-5-yl)azetidine-1-carboxylate

Participants

Reaction Steps

To a stirring suspension of 7-bromoimidazo[1,2-a]pyridine-3-carboxylic acid (24f) (400 mg, 1.67 mmol), in anhydrous dichloromethane (2 mL) at 0° C. under Argon was added dropwise oxalyl chloride (325 μL, 3.72 mmol). Then, a drop of anhydrous DMF was added and the reaction mixture was stirred at room temperature for 1.5 hour. The solvent was concentrated and the crude solid was added portion-wise to a stirring solution of methyl 3-(3-(3-amino-4-methylphenyl)-1,2,4-oxadiazol-5-yl)azetidine-1-carboxylate (31) (429 mg, 1.49 mmol) in anhydrous pyridine (1 mL) at 0° C. The reaction was stirred to room temperature under Argon for 30 minutes. Then, the reaction was quenched with water. The solvent was concentrated and the crude product was purified by silica chromatography to yield methyl 3-(3-(3-(7-bromoimidazo[1,2-a]pyridine-3-carboxamido)-4-methylphenyl)-1,2,4-oxadiazol-5-yl)azetidine-1-carboxylate (42). MS m/z 511.1 (M-F1)+.

Provenance & Evidence