Methanesulfonic Acid → 1-Cyclopropyl-6,8-difluoro-7-[3-(1,2,4-triazol-1-yl) pyrrolidin-1-yl]-1,4-dihydro-4-oxoquinoline-3-carboxylic acid methanesulfonate

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1-cyclopropyl-6,8-difluoro-7-[3-(1,2,4-triazol -1-yl)pyrrolidin-1-yl]-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (20 mg, 0.05 mmol) was dissolved in 2 ml of chloroform and to this was added 4 ml of methanesulfonic acid in chloroform. The suspension formed was stirred at room temperature for five hr. The solid was collected to yield 12 mg of white solid after drying very well in the oven, m.p. 208.5°-210° C. 1H NMR (CD3OD) δ: 9.54 (s, 1H), 8.78 (s, 1H), 8.64 (s, 1H), 7.81 (dd, 13.8, 2.3Hz, 1H), 5.47-5.3 (m, 1H), 4.5-3.8 (m, 5H), 2.88-2.5 (m, 2H), 2.7 (s, 3H), 1.4-1.1 (m, 4H). Anal. calcd. for C20H21F2N5O6S . H2O: C, 46.60; H, 4.50; N, 13.59.Found: C, 46.75; H, 4.38; N, 13.51.

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