Hydrogen Bromide → 1-Cyclopropyl-6-fluoro-8-methyl-7-(isoindolin-5-yl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid hydrobromide

HRID 1584829Notes

Reaction equation

HRID 1584829 reaction equation
[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:34])=[C:11]([C:15]4[CH:16]=[C:17]5[C:21](=[CH:22][CH:23]=4)[CH2:20][N:19](S(C4C=CC(C)=CC=4)(=O)=O)[CH2:18]5)[C:12]=3[CH3:14])[C:7](=[O:35])[C:6]([C:36]([OH:38])=[O:37])=[CH:5]2)[CH2:3][CH2:2]1.C1(O)C=CC=CC=1.C(O)(=O)CC.[BrH:51]>>[BrH:51].[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:34])=[C:11]([C:15]4[CH:16]=[C:17]5[C:21](=[CH:22][CH:23]=4)[CH2:20][NH:19][CH2:18]5)[C:12]=3[CH3:14])[C:7](=[O:35])[C:6]([C:36]([OH:38])=[O:37])=[CH:5]2)[CH2:2][CH2:3]1

Participants

5

Reactant 4

HCID 260Hydrogen BromideHCID 996PhenolHCID 1032Propionic AcidHCID 158708471-Cyclopropyl-6-fluoro-8-methyl-7-[2-(p-toluenesulfonyl)isoindolin-5-yl]-1,4-dihydro-4-oxoquinoline-3 carboxylic acid

Product 1

HCID 699595561-Cyclopropyl-6-fluoro-8-methyl-7-(isoindolin-5-yl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid hydrobromide

Procedure

In 5.3 ml of 47% hydrobromic acid was suspended 0.53 g of 1-cyclopropyl-6-fluoro-8-methyl-7-[2-(p-toluenesulfonyl)isoindolin-5-yl]-1,4-dihydro-4-oxoquinoline-3 carboxylic acid, and 0.28 g of phenol and 3.2 ml of propionic acid were added to the suspension, after which the resulting mixture was heated under reflux for one hour under a nitrogen stream. The reaction mixture was concentrated under reduced pressure, and ethanol was added to the residue obtained, after which the crystals formed were collected by filtration, to obtain 0.38 g of colorless, crystalline 1-cyclopropyl-6-fluoro-8-methyl-7-(isoindolin-5-yl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid hydrobromide. The hydrobromide obtained was suspended in 3.8 ml of ethanol and then dissolved in 7.6 ml of 0.5N aqueous sodium hydroxide solution, after which a carbon dioxide gas was blown into the solution. The crystals formed were collected by filtration, to obtain 0.27 g of colorless, crystalline 1-cyclopropyl-6-fluoro-8-methyl-7-(isoindolin-5-yl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid.

Workup

  1. additionwere added to the suspension
  2. temperatureafter which the resulting mixture was heated
  3. temperatureunder reflux for one hour under a nitrogen stream
  4. concentrationThe reaction mixture was concentrated under reduced pressure, and ethanol
  5. additionwas added to the residue
  6. customobtained
  7. customafter which the crystals formed
  8. filtrationwere collected by filtration

Sources & evidence

ORD record
ord-4558e7c442034d418e619be070893c03
Source dataset
uspto-grants-1999_08
Patent number
US05935952

Reaction notes

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