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

HRID 2050630Notes

Reaction equation

HRID 2050630 reaction equation
[NH2:1][C:2]1[C:11]([F:12])=[C:10](F)[CH:9]=[C:8]2[C:3]=1[C:4](=[O:20])[C:5]([C:17]([OH:19])=[O:18])=[CH:6][N:7]2[CH:14]1[CH2:16][CH2:15]1.[CH3:21][CH:22]1[CH2:27][NH:26][CH2:25][CH2:24][NH:23]1>N1C=CC=CC=1>[NH2:1][C:2]1[C:11]([F:12])=[C:10]([N:26]2[CH2:25][CH2:24][NH:23][CH:22]([CH3:21])[CH2:27]2)[CH:9]=[C:8]2[C:3]=1[C:4](=[O:20])[C:5]([C:17]([OH:19])=[O:18])=[CH:6][N:7]2[CH:14]1[CH2:16][CH2:15]1

Participants

4

Reactant 2

HCID 660572-MethylpiperazineHCID 148802095-Amino-1-cyclopropyl-6,7-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

Product 1

HCID 148802265-Amino-1-cyclopropyl-6-fluoro-7-(3-methyl-1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acidYield 62.2%

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

A mixture of 1.0 g of 5-amino-1-cyclopropyl-6,7-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid, 1.18 g of 2-methylpiperazine and 10 ml of pyridine was heated under reflux for 3 hours. The reaction mixture was concentrated under reduced pressure, and the residue was dissolved in 28% aqueous ammonia. The solution was neutralized with a 10% aqueous solution of acetic acid and cooled with ice. The crystals were collected by filtration, dissolved in a 10% aqueous solution of acetic acid, treated with activated charcoal, adjusted to pH 8-9 with 29% aqueous ammonia, and cooled with ice. The crystals were collected by filtration and washed successively with water and ethanol to give 0.80 g of 5-amino-1-cyclopropyl-6-fluoro-7-(3-methyl-1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid. m.p. 181°-183° C.

Workup

  1. temperaturewas heated
  2. temperatureunder reflux for 3 hours
  3. concentrationThe reaction mixture was concentrated under reduced pressure
  4. dissolutionthe residue was dissolved in 28% aqueous ammonia
  5. temperaturecooled with ice
  6. filtrationThe crystals were collected by filtration
  7. dissolutiondissolved in a 10% aqueous solution of acetic acid
  8. additiontreated with activated charcoal
  9. temperaturecooled with ice
  10. filtrationThe crystals were collected by filtration
  11. washwashed successively with water and ethanol

Sources & evidence

ORD record
ord-2415d5ae2e4e4873942c3c83df8efe52
Source dataset
uspto-grants-1991_05
Patent number
US05013841

Reaction notes

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