Dabco → 1-Cyclopropyl-6-fluoro-1,4-dihydro-7-[4-(6-hydroxy-2,2-dimethyl-1,3-dioxepan-5-yl)-1-piperazinyl]-4-oxo-3-quinolinecarboxylic acid

HRID 1382215Notes

Reaction equation

HRID 1382215 reaction equation
Cl[C:2]1[CH:11]=[C:10]2[C:5]([C:6](=[O:18])[C:7]([C:15]([OH:17])=[O:16])=[CH:8][N:9]2[CH:12]2[CH2:14][CH2:13]2)=[CH:4][C:3]=1[F:19].[OH:20][CH:21]1[CH2:27][O:26][C:25]([CH3:29])([CH3:28])[O:24][CH2:23][CH:22]1[N:30]1[CH2:35][CH2:34][NH:33][CH2:32][CH2:31]1.N12CCN(CC1)CC2>CS(C)=O>[CH:12]1([N:9]2[C:10]3[C:5](=[CH:4][C:3]([F:19])=[C:2]([N:33]4[CH2:34][CH2:35][N:30]([CH:22]5[CH:21]([OH:20])[CH2:27][O:26][C:25]([CH3:29])([CH3:28])[O:24][CH2:23]5)[CH2:31][CH2:32]4)[CH:11]=3)[C:6](=[O:18])[C:7]([C:15]([OH:17])=[O:16])=[CH:8]2)[CH2:14][CH2:13]1

Participants

5

Reactant 3

HCID 9237DabcoHCID 483180Fluoroquinolonic acidHCID 212744861-(6-Hydroxy-2,2-dimethyl-1,3-dioxepan-5-yl)-piperazine

Product 1

HCID 138507991-Cyclopropyl-6-fluoro-1,4-dihydro-7-[4-(6-hydroxy-2,2-dimethyl-1,3-dioxepan-5-yl)-1-piperazinyl]-4-oxo-3-quinolinecarboxylic acidYield 10.5%

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

2.8 g (10 mmol) of 7-chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid are heated at 140° in 30 ml of dimethyl sulphoxide with 2.5 g (11 mmol) of 1-(6-hydroxy-2,2-dimethyl-1,3-dioxepan-5-yl)-piperazine and 2.25 g (20 mmol) of 1,4-diazabicyclo[2.2.2]octane for 4 hours, the reaction mixture is concentrated, the resulting oil is diluted with 20 ml of methanol and the pH is brought to 5 with 2N hydrochloric acid. The precipitate which has separated out is recrystallized from glycol monomethyl ether/methanol. 0.5 g of 1-cyclopropyl-6-fluoro-1,4-dihydro-7-[4-(6-hydroxy-2,2-dimethyl-1,3-dioxepan-5-yl)-1-piperazinyl]-4-oxo-3-quinolinecarboxylic acid of melting point 255°-262° (with decomposition) is obtained, and is dissolved in 10 ml of 2N hydrochloric acid, with warming, to split off the protective group. After the solution has been left to stand at room temperature for 1 hour, 0.3 g of 1-cyclopropyl-6-fluoro-1,4-dihydro-7-[4-(1,3,4-trihydroxy-2-butyl)-1-piperazinyl]-4-oxo-3-quinolinecarboxylic acid of melting point 262°-268° (with decomposition) has precipitated.

Workup

  1. concentrationthe reaction mixture is concentrated
  2. additionthe resulting oil is diluted with 20 ml of methanol
  3. customThe precipitate which has separated out
  4. customis recrystallized from glycol monomethyl ether/methanol

Sources & evidence

ORD record
ord-7a4dccf680bd4060b9ba03215390077d
Source dataset
uspto-grants-1989_02
Patent number
US04806539

Reaction notes

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