تفاعل #1388

معادلة التفاعل

ethyl 7-(1-piperazinyl)-1-cyclopropyl-6-fluoro-5-methyl-1,4-dihydro-4-oxoquinoline-3-carboxylate

sodium hydroxide

ethanol

→

7-(1-piperazinyl)-1-cyclopropyl-6-fluoro-5-methyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

المردود 56.4%

المذيبات

water

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةthe mixture is refluxed for 1 hour
2. 2
   درجة الحرارةAfter cooling
3. 3
   غسيلwashed with dichloromethane
4. 4
   استخلاصThe resultant is extracted with dichloromethane
5. 5
   أخرىthe extract is dried
6. 6
   workup.DISTILLATIONThe solvent is distilled off under reduced pressure and to the residue
7. 7
   workup.ADDITIONis added ethanol
8. 8
   ترشيحThe precipitated crystals are filtered
9. 9
   أخرىrecrystallized from dimethylformamide

الإجراء التجريبي

To ethyl 7-(1-piperazinyl)-1-cyclopropyl-6-fluoro-5-methyl-1,4-dihydro-4-oxoquinoline-3-carboxylate (23 mg) are added 10% aqueous solution of sodium hydroxide (3 ml) and ethanol (3 ml), and the mixture is refluxed for 1 hour. After cooling, the reaction mixture is diluted with water and washed with dichloromethane. After the aqueous layer is made acidic with acetic acid and then made weak alkaline with an aqueous sodium hydrogen carbonate. The resultant is extracted with dichloromethane and the extract is dried. The solvent is distilled off under reduced pressure and to the residue is added ethanol. The precipitated crystals are filtered and recrystallized from dimethylformamide to give 7-(1-piperazinyl)-1-cyclopropyl-6-fluoro-5-methyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (12 mg), as white powder, m.p. 231°-233° C.

المصدر