Reaktion #76565

Reaktionsgleichung

sodium bicarbonate

triethylamine

3-amino-7-fluoro-4-quinolinol hydrochloride

Butyryl chloride

→

N-(7-fluoro-4-hydroxyquinolin-3-yl)butanamide

Ausbeute 86.3%

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGto stir at ambient temperature for about 1 hour
2. 2
   FiltrationThe resulting biphasic mixture was filtered
3. 3
   Sonstigeto remove solids
4. 4
   WaschenThe solids were rinsed with diethyl ether
5. 5
   Sonstigeto provide a slightly pink powder
6. 6
   EinengenThe tetrahydrofuran layer was concentrated under vacuum
7. 7
   Sonstigeto provide a dark pink solid
8. 8
   SonstigeThis solid was triturated with ether
9. 9
   Sonstigeoven dried

Vorschrift

Under a nitrogen atmosphere, triethylamine (6.4 mL, 46.2 mmol) was added to a suspension of 3-amino-7-fluoro-4-quinolinol hydrochloride (3 g, 14.0 mmol) in tetrahydrofuran. (50 mL). Butyryl chloride (1.6 mL, 15.4 mmol) was added dropwise at ambient temperature. The reaction mixture was stirred at ambient temperature for 4 hours. Aqueous sodium bicarbonate was added and the reaction mixture was allowed to stir at ambient temperature for about 1 hour. The resulting biphasic mixture was filtered to remove solids. The solids were rinsed with diethyl ether to provide a slightly pink powder. The tetrahydrofuran layer was concentrated under vacuum to provide a dark pink solid. This solid was triturated with ether and then oven dried. The solids were combined to provide 3.0 g of N-(7-fluoro-4-hydroxyquinolin-3-yl)butanamide. A 300 mg portion was recrystallized from ethyl acetate/ethanol to provide a light gray fluffy solid, m.p. 306-308° C. Analysis: Calculated for C13H13FN2O2: %C, 62.90; %H, 5.28; %N, 11.28; Found: %C, 62.95; %H, 5.34; %N, 11.14.

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