1,8-Diazabicyclo(5.4.0)undec-7-ene → 1-Cyclopropyl-6,8-difluoro-7-[3-(1,2,4-triazol-1-yl) pyrrolidin-1-yl]-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

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To a solution of 1-cyclopropyl-6,7,8-trifluoro -1,4-dihydro-4-oxoquinoline-3-carboxylic acid (70.75 mg, 0.25 mmol) and 3-(1,2,4-triazol-1-yl)pyrrolidine hydrochloride (100 mg) 3 ml of dry pyridine under nitrogen was added 152 mg (1 mmol) of DBU and the solution was heated at 95° C. overnight. The orange solution was then concentrated under reduced pressure and water was added to the residue and the solid was collected and dried to yield 50 mg (50%) of a gray solid, m.p. 219.7°-220.7° C. 1H NMR (TFA) δ: 9.8 (s, 1H), 9.29 (s, 1H), 8.78 (s, 1H), 8.11 (d, J=12.5, 1H), 5.85-5.58 (m, 1H), 4.9-4.2 (m, 5H), 3.00-2.7 (m, 2H), 1.75-1.3 (m, 4H). Anal. calcd. for C19H17F2N5O3 : C, 56.86; H, 4.27; N, 17.45. Found: C, 56.80; H, 4.41; N, 17.48.

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