Reacción #4668

Ecuación de reacción

dopamine hydrobromide

nicotinic acid

dicyclohexylcarbodiimide

→

N-nicotinoyldopamine

Rendimiento 70.0%

Disolventes

pyridine

Condiciones de reacción

Tratamiento posterior

1. 1
   Otrothe formed dicyclohexylurea was removed by filtration
2. 2
   OtroThe pyridine was removed in vacuo
3. 3
   Otrothe residue was crystallized from water at 0° C
4. 4
   OtroThe product was isolated by filtration
5. 5
   Secadodried over phosphorous pentoxide
6. 6
   OtroRecrystallization from isopropanol

Procedimiento

To a pyridine solution containing 11.7 g (0.05 mol) dopamine hydrobromide and 6.15 g (0.05 mol) nicotinic acid at 0° C. were added 10.3 g (0.05 mol) dicyclohexylcarbodiimide (DCC). The reaction mixture was stirred at room temperature for 24 hours and the formed dicyclohexylurea was removed by filtration. The pyridine was removed in vacuo and the residue was crystallized from water at 0° C. The product was isolated by filtration and dried over phosphorous pentoxide. Recrystallization from isopropanol gave 9.0 g (0.035 mol), 70% N-nicotinoyldopamine, m.p. 159°-162° C.; aqueous solution of the compound gave a green color with Fe+3 and reduced AgNO3 ; ir (KBr) 3300, 2960, 1725, 1630, 1590, 1520, 1430, 1290, 1190, 1115, 720 and 710 cm-1 ; NMR (d6 -DMSO) δ 9.25-6.25 (m, 7H), 3.3 (m, 2H) and 2.65 (m, 2H) ppm. Anal. (C14H14N2O3) C, H, N.

Fuente