Piperazine → ethyl 6,8-difluoro-1-methyl-4-oxo-7-(1-piperazinyl)-4H-[1,3]thiazeto[3,2-a]quinoline-3-carboxylate

HRID 1085782Notes

Reaction equation

[F:1][C:2]1[CH:3]=[C:4]2[C:9](=[C:10]([F:13])[C:11]=1F)[N:8]1[CH:14]([CH3:16])[S:15][C:7]1=[C:6]([C:17]([O:19][CH2:20][CH3:21])=[O:18])[C:5]2=[O:22].C(=O)([O-])[O-].[K+].[K+].[NH:29]1[CH2:34][CH2:33][NH:32][CH2:31][CH2:30]1>CN(C)C=O>[F:1][C:2]1[CH:3]=[C:4]2[C:9](=[C:10]([F:13])[C:11]=1[N:29]1[CH2:34][CH2:33][NH:32][CH2:31][CH2:30]1)[N:8]1[CH:14]([CH3:16])[S:15][C:7]1=[C:6]([C:17]([O:19][CH2:20][CH3:21])=[O:18])[C:5]2=[O:22]

Participants

Conditions

Temperature: 60 °C

Procedure

Ethyl 6,7,8-trifluoro-1-methyl-4-oxo-4H-[1,3]thiazeto[3,2-a]quinoline-3-carboxylate (0.33 g) and 0.14 g of potassium carbonate were suspended in 10 ml of N,N-dimethylformamide, 0.13 g of anhydrous piperazine was added and the mixture was stirred at 60° C. for 2 hours. N,N-Dimethylformamide was evaporated therefrom in vacuo, the residue was dissolved in chloroform, the solution was washed with water, dried over magnesium sulfate, the solvent was evaporated therefrom, the residue was subjected to a silica gel column chromatography (30 g of Wakogel C-300 being used) and eluted with chloroform-methanol (4:1) to give 0.29 g of the title product, m.p. 195°-198° C. (decompn).

Workup

customN,N-Dimethylformamide was evaporated
dissolutionin vacuo, the residue was dissolved in chloroform
washthe solution was washed with water
dry with materialdried over magnesium sulfate
customthe solvent was evaporated
washeluted with chloroform-methanol (4:1)

Sources & evidence

ORD record: ord-02a4579fc57b49e782eaf4c5f508d360
Source dataset: uspto-grants-1991_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05011831

Reaction notes

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