Reaktion #705205

Reaktionsgleichung

dimethylaminopyridine

6-iodonicotinic acid

1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride

ethanol

→

title compound

Ethyl 6-iodonicotinoate

Lösungsmittel

dichloromethane

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Einengenconcentrated in vacuo
2. 2
   workup.ADDITIONdiluted with water (200 ml)
3. 3
   Extraktionthen extracted with ethyl ether (550 ml)
4. 4
   WaschenThe combined organic phases were washed with saturated aqueous NaCl
5. 5
   Trocknendried (MgSO4)
6. 6
   Einengenconcentrated to a yellow solid
7. 7
   SonstigePurification by flash chromatography (silica, 10% EtOAc-hexane)

Vorschrift

To a suspension of 6-iodonicotinic acid (23.38 g, 94.20 mmol) in dichloromethane (100 ml) was added a solution of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (19.86 g, 103.6 mmol) in dichloromethane (250 ml). To this mixture was added ethanol (12.40 g, 269.27 mmol) followed by dimethylaminopyridine (1.15 g, 9.41 mmol). The mixture was heated at 50° C. for 24.5 hours, concentrated in vacuo, and diluted with water (200 ml) then extracted with ethyl ether (550 ml). The combined organic phases were washed with saturated aqueous NaCl, dried (MgSO4) and concentrated to a yellow solid. Purification by flash chromatography (silica, 10% EtOAc-hexane) afforded the title compound as white needles: mp 48-49° C.; 1H NMR (CDCl3): δ 8.94 (1H, d, J=2.1 Hz), 7.91 (1H, dd, J=2.1, 8.2 Hz), 7.85 (1H, d, J=8.2 Hz), 4.41 (2H, q, J=7.1 Hz), 1.41 (3H, t, J=7.1 Hz).

Quelle