Hydrochloric Acid → HCID 12899683, compound

HRID 1649434Notes

Reaction equation

HRID 1649434 reaction equation
Cl[C:2]1[C:13]2=[C:14]3[N:9]([CH2:10][CH2:11][CH2:12]2)[CH:8]=[C:7]([C:15]([OH:17])=[O:16])[C:6](=[O:18])[C:5]3=[CH:4][CH:3]=1.[NH:19]1[CH2:24][CH2:23][NH:22][CH2:21][CH2:20]1.CS(C)=O.Cl>[OH-].[Na+]>[N:19]1([C:2]2[C:13]3=[C:14]4[N:9]([CH2:10][CH2:11][CH2:12]3)[CH:8]=[C:7]([C:15]([OH:17])=[O:16])[C:6](=[O:18])[C:5]4=[CH:4][CH:3]=2)[CH2:24][CH2:23][NH:22][CH2:21][CH2:20]1

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 679Dimethyl SulfoxideHCID 4837PiperazineHCID 12899682HCID 12899682, compound

Product 1

HCID 12899683HCID 12899683, compoundYield 28.5%

Reagents, catalysts & solvents 1

HCID 14798Sodium HydroxideSolvent

Procedure

19.2 g of 8-chloro-6,7-dihydro-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid and 35.5 g of piperazine were added to 350 ml of anhydrous dimethyl sulfoxide and the mixture was heated to an oil bath at 170° to 180° C. for 6 hours while stirring. After completion of the reaction, the solvent was removed under reduced pressure. 500 ml of water was added to the residue and the pH value of the mixture was adjusted to a pH of 2 followed by filtering water-insoluble materials. The filtrate was concentrated to 100 ml under reduced pressure and rendered alkaline (pH=9) with a 10% aqueous sodium hydroxide solution. After extracting the aqueous alkali solution with chloroform to thereby remove chloroform-soluble materials, the aqueous alkali solution layer was allowed to stand to precipitate crystals which were filtered. The crude crystals thus obtained were dissolved in 10 ml of a 10% aqueous sodium hydroxide solution and the solution was treated with activated carbon and adjusted to a pH of 8 with a 10% aqueous hydrochloric acid solution to precipitate crystals which were filtered and washed with water sufficiently. Recrystallization of the crystals from dimethylformamide gave 6.5 g of 8-(1-piperazinyl)-6,7-dihydro-1-oxo-1H,5H-benzo[ij]-quinolizine-2-carboxylic acid as white needles having a melting point of 267° to 268° C.

Workup

  1. temperaturethe mixture was heated to an oil bath at 170° to 180° C. for 6 hours
  2. customAfter completion of the reaction
  3. customthe solvent was removed under reduced pressure
  4. addition500 ml of water was added to the residue
  5. filtrationby filtering water-insoluble materials
  6. concentrationThe filtrate was concentrated to 100 ml under reduced pressure
  7. extractionAfter extracting the aqueous alkali solution with chloroform to thereby remove chloroform-soluble materials
  8. customto precipitate crystals which
  9. filtrationwere filtered
  10. customThe crude crystals thus obtained
  11. additionthe solution was treated with activated carbon
  12. customto precipitate crystals which
  13. filtrationwere filtered
  14. washwashed with water sufficiently
  15. customRecrystallization of the crystals from dimethylformamide

Sources & evidence

ORD record
ord-6c9a0e1d2ef140aea03ac2102ab28107
Source dataset
uspto-grants-1983_11
Patent number
US04416884

Reaction notes

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