1,8-Diazabicyclo(5.4.0)undec-7-ene → 1-Cyclopropyl-7-[3,7-diazabicyclo[3.3.0]oct-1(5)-en-3-yl]-6,8-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

Participants

Reaction Steps

The solution of 0.4 g of 1-cyclopropyl-6,7,8-trifluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid, 0.8 g of 3,7-diazabicyclo[3.3.0]oct-1(5)-ene dihydrobromide, and 0.8 ml of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in 30 ml of acetonitrile was refluxed in oil bath at the temperature of 100° C. for 8 hours, and this reaction mixture was kept overnight at the room temperature. The product precipitate was filtered off and then the residue was washed with methanol, to obtain 0.35 g of the title compound (yield 67%).

Provenance & Evidence