Acetonitrile → 1-Cyclopropyl-7-(2,5-diazabicyclo[2.2.1]heptan-2-yl)-6,8-difluoro-4-oxo-quinoline-3-carboxylic acid

HRID 483293Notes

Reaction equation

HRID 483293 reaction equation
[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:16])=[C:11](F)[C:12]=3[F:14])[C:7](=[O:17])[C:6]([C:18]([O:20]C)=[O:19])=[CH:5]2)[CH2:3][CH2:2]1.I[Si](C)(C)C.Br.Br.[CH:29]12[CH2:35][CH:32]([NH:33][CH2:34]1)[CH2:31][NH:30]2.C(#N)C>ClCCl>[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:16])=[C:11]([N:30]4[CH2:31][CH:32]5[CH2:35][CH:29]4[CH2:34][NH:33]5)[C:12]=3[F:14])[C:7](=[O:17])[C:6]([C:18]([OH:20])=[O:19])=[CH:5]2)[CH2:2][CH2:3]1

Participants

6

Reactant 4

HCID 6342AcetonitrileHCID 85247Trimethylsilyl iodide2×HCID 13590045Methyl 1-cyclopropyl-6,7,8-trifluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylateHCID 162131472,5-Diazabicyclo[2.2.1]heptane dihydrobromide

Product 1

HCID 4695551-Cyclopropyl-7-(2,5-diazabicyclo[2.2.1]heptan-2-yl)-6,8-difluoro-4-oxo-quinoline-3-carboxylic acidYield 92%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 1.0 g (3.4 mmole) of methyl 1-cyclopropyl-6,7,8-trifluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylate in 25 ml dichloromethane was added 0.6 ml (0.8 g, 4.2 mmole) of iodotrimethylsilane while stirring at room temperature under a blanket of nitrogen. The reaction was warmed to reflux and stirred overnight. An additional 0.23 ml (1.6 mmole) of iodotrimethylsilane was added and the solution was refluxed for another two hours, cooled to room temperature, and concentrated. The residue was taken up in 20 ml of acetonitrile. To this solution was added a mixture of 2.2 g (8.5 mmole) of 2,5-diazabicyclo[2.2.1]heptane, dihydrobromide, 2.7 g (17.9 mmole) 1,8-diazobicyclo[5.4.0]undec-7-ene and 20 ml acetonitrile. The reaction was refluxed for 2.5 hours then cooled to room temperature. The formed precipitate was filtered, washed with acetonitrile and ethyl ether, yielding 1.13 g (92%) of the title compound, mp 288°-290° C.

Workup

  1. temperatureThe reaction was warmed
  2. temperatureto reflux
  3. stirringstirred overnight
  4. temperaturethe solution was refluxed for another two hours
  5. temperaturecooled to room temperature
  6. concentrationconcentrated
  7. additionTo this solution was added
  8. temperatureThe reaction was refluxed for 2.5 hours
  9. temperaturethen cooled to room temperature
  10. filtrationThe formed precipitate was filtered
  11. washwashed with acetonitrile and ethyl ether

Sources & evidence

ORD record
ord-b9ba5e88e1da40d784731fb8887f0ffe
Source dataset
uspto-grants-1986_03
Patent number
US04578473

Reaction notes

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