Reaktion #4668

Reaktionsgleichung

dopamine hydrobromide

nicotinic acid

dicyclohexylcarbodiimide

→

N-nicotinoyldopamine

Ausbeute 70.0%

Lösungsmittel

pyridine

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe formed dicyclohexylurea was removed by filtration
2. 2
   SonstigeThe pyridine was removed in vacuo
3. 3
   Sonstigethe residue was crystallized from water at 0° C
4. 4
   SonstigeThe product was isolated by filtration
5. 5
   Trocknendried over phosphorous pentoxide
6. 6
   SonstigeRecrystallization from isopropanol

Vorschrift

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.

Quelle