Water → 1-Cyclopropyl-6,7-difluoro-1,4-dihydro-8-(3-methyl-but-3-en-1-inyl)-4-oxo-3-quinolinecarboxylic acid

Participants

Reaction Steps

0.715 g of ethyl 1-cyclopropyl-6,7-difluoro-1,4-dihydro-8-(3-methyl-but-3-en-1-inyl)-4-oxo-3-quinolinecarboxylate is refluxed for 1.5 hours in a mixture of 10 ml of glacial acetic acid, 0.5 ml of water and 0.2 ml of concentrated sulphuric acid. The reaction mixture is poured into 100 ml of water. The solid which has precipitated is filtered off with suction, washed with water and dried. 0.53 g of 1-cyclopropyl-6,7-difluoro-1,4-dihydro-8-(3-methyl-but-3-en-1-inyl)-4-oxo-3-quinolinecarboxylic acid is obtained (80% of theory).

Provenance & Evidence