Reacción #1195627

Ecuación de reacción

sodium methoxide

2-amino-2-cyanoacetamide

acetic acid

methylglyoxal

→

3-methoxy-5-methylpyrazine-2-carboxamide

Rendimiento 50.0%

Disolventes

methanol

Condiciones de reacción

Tratamiento posterior

1. 1
   Otro2 hours
2. 2
   workup.STIRRINGThe mixture was stirred at 20° C. for 2 hours
3. 3
   workup.DISTILLATIONThe solvent was distilled off
4. 4
   Otrothe 3-methoxy-5-methylpyrazine-2-carboxamide was purified by column chromatography (eluent: ethyl acetate/methanol 4:1)

Procedimiento

Under argon, 6 g (60.5 mmol) of 2-amino-2-cyanoacetamide was initially charged in 67 g of methanol. 1.67 g (9.3 mmol) of sodium methoxide solution (30%) was added and the mixture was stirred for at 20° C. 2 hours. After neutralization with 0.558 g (9.3 mmol) of acetic acid, 11.55 g (64.1 mmol) of methylglyoxal solution (40%) was added. The mixture was stirred at 20° C. for 2 hours and then at 50° C. for 2 hours. The solvent was distilled off and the 3-methoxy-5-methylpyrazine-2-carboxamide was purified by column chromatography (eluent: ethyl acetate/methanol 4:1). This gave 5 g of 3-methoxy-5-methylpyrazine-2-carboxamide. The yield was 50 percent. Other data concerning the title product was:

Fuente