Réaction #4668

Équation de réaction

dopamine hydrobromide

nicotinic acid

dicyclohexylcarbodiimide

→

N-nicotinoyldopamine

Rendement 70.0%

Solvants

pyridine

Conditions de réaction

Traitement

1. 1
   Autrethe formed dicyclohexylurea was removed by filtration
2. 2
   AutreThe pyridine was removed in vacuo
3. 3
   Autrethe residue was crystallized from water at 0° C
4. 4
   AutreThe product was isolated by filtration
5. 5
   Séchagedried over phosphorous pentoxide
6. 6
   AutreRecrystallization from isopropanol

Mode opératoire

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.

Source