Acetic Acid → Methyl pyrimidine-5-carboximidate

Participants

Reaction Steps

To a stirred suspension of 5-cyanopyrimidine (5.0 g, 47 mmol) in methanol (50 mL) was added 25% by weight sodium methoxide in methanol (1.2 g, 23 mmol). The mixture was stirred at room temperature for 17 h under nitrogen atmosphere and then acetic acid (2.72 ml, 47 mmol) was added dropwise. The resulting mixture was stirred for 4 h and then evaporated under reduced pressure to remove methanol and yield a residue. The residue was dissolved in ether (150 mL) and the solids were removed by filtration. The filtrate was concentrated under reduced pressure to yield methylpyrimidine-5-carbimidate (4.9 g, 75% yield). The crude product was used without further purification. 1H NMR (400 MHz, DMSO-d6, δ): 3.83 (s, 3H); 9.18 (s, 2H); 9.30 (s, 1H); 9.54 (s, 1H). ES-MS: [M++1]=138.

Provenance & Evidence