Ethyl 1-cyclopropyl-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate → 1-Cyclopropyl-6,7-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

HRID 248539Notes

Reaction equation

[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:15])=[C:11]([F:14])[CH:12]=3)[C:7](=[O:16])[C:6]([C:17]([O:19]CC)=[O:18])=[CH:5]2)[CH2:3][CH2:2]1>S(=O)(=O)(O)O>[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:15])=[C:11]([F:14])[CH:12]=3)[C:7](=[O:16])[C:6]([C:17]([OH:19])=[O:18])=[CH:5]2)[CH2:2][CH2:3]1

Participants

Conditions

Temperature: 100 °C

Procedure

A suspension of 7.85 g of 1-cyclopropyl-6,7-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, ethyl ester in 220 ml of 2N sulfuric acid was heated at 100° C. overnight, then cooled in an ice bath. The solid was collected, washed with water and dried, giving 6.81 g of the desired compound, mp 292°-293° C.

Workup

temperaturecooled in an ice bath
customThe solid was collected
washwashed with water
customdried

Sources & evidence

ORD record: ord-f37b09802b9a492f89c06d9d5c23ebdc
Source dataset: uspto-grants-1993_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05210193

Reaction notes

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