Reaktion #4881

Reaktionsgleichung

diisopropyl amine

n-butyllithium

hexane

2-chloroquinoline

dry ice

→

white crystals

Ausbeute 62.0%

2-Chloro-3-quinolinecarboxylic acid

Ausbeute 62.0%

Lösungsmittel

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwhile maintaining the temperature at -60° to -70° C
2. 2
   workup.ADDITIONSubsequent to this addition
3. 3
   Temperaturwhile maintaining the temperature at -60° to -70° C
4. 4
   Sonstigeat -65° C.
5. 5
   Sonstigefor 20 minutes
6. 6
   workup.ADDITIONsubsequent to this addition
7. 7
   Sonstigethe entire reaction mixture
8. 8
   SonstigeMost of the solvent was evaporated in a stream of air
9. 9
   Sonstigethe residual solvent was removed by rotary evaporation
10. 10
    Waschenwashed with 3×50 ml of isopropyl ether
11. 11
    FiltrationThe aqueous layer was filtered
12. 12
    SonstigeThe precipitate was collected
13. 13
    Waschenwashed with water, isopropyl alcohol, and isopropyl ether
14. 14
    Sonstigedried

Vorschrift

To a solution of 21.3 ml (0.15 mole) of diisopropyl amine in 300 ml of dry tetrahydrofuran under a continuous nitrogen blanket, at -70° C., was added 61.6 ml of 2.7M n-butyllithium in hexane (0.165 mole) while maintaining the temperature at -60° to -70° C. Subsequent to this addition, the temperature was maintained at -65° C. for approximately 20 minutes. A solution of 20 g (0.12 mole) of 2-chloroquinoline in 60 ml of tetrahydrofuran was added dropwise while maintaining the temperature at -60° to -70° C. After holding the temperature at -65° C. for 20 minutes subsequent to this addition, the entire reaction mixture was poured onto a large excess of dry ice. Most of the solvent was evaporated in a stream of air; the residual solvent was removed by rotary evaporation. The residue was taken up in 300 ml water, made basic with dil aq. sodium hydroxide and washed with 3×50 ml of isopropyl ether. The aqueous layer was filtered and made acidic (4 to 5 pH) with dilute aqueous hydrochloric acid. The precipitate was collected, washed with water, isopropyl alcohol, and isopropyl ether, and dried, giving 15.4 g (62%) of white crystals, m.p. 190°-210° C. (decomp.). A sample was recrystallized from isopropyl alcohol giving an analytical sample, m.p. 190°-210° C. (decomp.).

Quelle