2-Methylpiperazine → 1-Cyclopropyl-8-ethenyl-6-fluoro-1,4-dihydro-7-(3-methyl-1-piperazinyl)-4-oxo-3-quinolinecarboxylic acid

HRID 728312Notes

Reaction equation

HRID 728312 reaction equation
[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:17])=[C:11](F)[C:12]=3[CH:14]=[CH2:15])[C:7](=[O:18])[C:6]([C:19]([OH:21])=[O:20])=[CH:5]2)[CH2:3][CH2:2]1.[CH3:22][CH:23]1[CH2:28][NH:27][CH2:26][CH2:25][NH:24]1>C(#N)C>[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:17])=[C:11]([N:27]4[CH2:26][CH2:25][NH:24][CH:23]([CH3:22])[CH2:28]4)[C:12]=3[CH:14]=[CH2:15])[C:7](=[O:18])[C:6]([C:19]([OH:21])=[O:20])=[CH:5]2)[CH2:3][CH2:2]1

Participants

4

Reactant 2

HCID 660572-MethylpiperazineHCID 193650241-Cyclopropyl-8-ethenyl-6,7-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid

Product 1

HCID 197864421-Cyclopropyl-8-ethenyl-6-fluoro-1,4-dihydro-7-(3-methyl-1-piperazinyl)-4-oxo-3-quinolinecarboxylic acidYield 78%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Conditions

Temperature
0 °C

Procedure

A mixture of 1-cyclopropyl-8-ethenyl-6,7-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid (0.80 g, 2.9 mmol), 2-methylpiperazine (1.9 g, 19 mmol) and acetonitrile (5 mL) was heated at reflux for 22 hours. The mixture was cooled and concentrated. The residue was dissolved in H2O (50 mL), treated with charcoal and filtered through celite. The pH of the filtrate was adjusted to 7, with HCl (3N) and after cooling to 0° C. the precipitate was collected and dried to provide 0.81 g (78%) of the desired product; mp 227°-231° dec.

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 22 hours
  3. temperatureThe mixture was cooled
  4. concentrationconcentrated
  5. dissolutionThe residue was dissolved in H2O (50 mL)
  6. additiontreated with charcoal
  7. filtrationfiltered through celite
  8. customwas collected
  9. customdried

Sources & evidence

ORD record
ord-ba7e9964ecae412c8fdc1fb4133c68c1
Source dataset
uspto-grants-1991_09
Patent number
US05047538

Reaction notes

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