Reaktion #170083

Reaktionsgleichung

Bromine

2-amino-3-(hydroxymethyl)pyridine

(E)-3-(7-Oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)-acrylic acid hydrochloride

acetic acid

→

title product

2-Amino-5-bromo-3-(hydroxymethyl)pyridine

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenAfter concentration to dryness
2. 2
   Sonstigethe residue was partitioned between a saturated solution of potassium carbonate (300 mL) and ethyl acetate (200 mL)
3. 3
   SonstigeThe aqueous layer was separated
4. 4
   Extraktionextracted with ethyl acetate (2×200 mL)
5. 5
   WaschenThe combined organic phases were washed with a saturated solution of sodium chloride (200 mL)
6. 6
   Trocknendried over sodium sulfate
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated to dryness

Vorschrift

Bromine (8.4 mL, 189.4 mmol) was added dropwise over 1 hour to a solution of 2-amino-3-(hydroxymethyl)pyridine (19.6 g, 157.8 mmol; which may be prepared as described in D1, Step 1) in acetic acid (350 mL) at room temperature. The reaction mixture was then stirred overnight. After concentration to dryness, the residue was partitioned between a saturated solution of potassium carbonate (300 mL) and ethyl acetate (200 mL). The aqueous layer was separated and extracted with ethyl acetate (2×200 mL). The combined organic phases were washed with a saturated solution of sodium chloride (200 mL), dried over sodium sulfate, filtered and concentrated to dryness. After trituration of the residue in pentane, the title product was obtained as a yellow solid (27.0 g, 84%).

Quelle