Reacción #2487400

Ecuación de reacción

methyl 6-oxo-1,6-dihydropyridine-2-carboxylate

potassium carbonate

methyl iodide

→

product

Rendimiento 28.5%

Methyl 1-methyl-6-oxo-1,6-dihydropyridine-2-carboxylate

Rendimiento 28.5%

Disolventes

DMSO

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONwas added
2. 2
   Temperaturathe reaction refluxed for 4 hours
3. 3
   OtroThe solvent was removed under reduced pressure
4. 4
   Extracciónthe resulting oil was extracted with hot hexanes (8×25 mL)
5. 5
   Otrosolvent removed
6. 6
   Otroto yield a yellow oil
7. 7
   OtroRecrystallization from hexanes

Procedimiento

In Example 22, 0.4006 g (2.611 mmol) of methyl 6-oxo-1,6-dihydropyridine-2-carboxylate and 0.4006 g (2.899 mmol) of potassium carbonate were combined in a 25 mL RBF. 1 mL of DMSO followed by 4 mL (64.25 mmol) of methyl iodide was added and the reaction refluxed for 4 hours. The solvent was removed under reduced pressure and the resulting oil was extracted with hot hexanes (8×25 mL), the extracts were combined and solvent removed to yield a yellow oil. Recrystallization from hexanes yielded the product as white/yellow crystals (0.1245 g, 28.52%). Melting Point: 56-57° C. IR: (Nujol) 3437.61, 1731.13, 1652.94, 1590.77, 1457.45, 1443.48, 1379.43, 1265.53, 1218.08, 1156.78, 1086.06, 900.89, 825.45, 817.06, 765.03, 755.48, 722.85 cm−1. 1H NMR: (500 MHz, CDCl3) 3.67 (s, 3H), 3.91 (s, 3H), 6.71 (dd, J=1.2, 9.1 Hz, 1H), 6.74 (dd, J=1.2, 6.8 Hz, 1H), 7.29 (dd, J=6.7, 9.1 Hz, 1H). 13C NMR: (126 MHz, CDCl3) 33.40, 52.90, 110.42, 124.46, 137.21, 138.21, 162.45, 162.70.

Fuente