Ammonium formate → 7-methyl-3H,4H-thieno[3,2-d]pyrimidin-4-one

Participants

Reaction Conditions

Reaction Steps

To a solution of ammonium formate (5.1 g, 81 mmol) in formamide (25 mL) at 150° C. was added 3-(formylamino)4-methyl-2-thiophenecarboxylic acid methyl ester (2, 5.0 g, 25 mmol) as a solid in small portions. The resulting solution was heated at 150° C. for 5 hours and then allowed to stand at room temperature for 12 hours. The precipitate that formed was collected by vacuum filtration to give 7-methyl-3H-thieno[3,2-d]pyrimidin-4-one (3.4 g, 84% yield) as white needles.

Provenance & Evidence