Garenoxacin Mesylate → Garenoxacin

Participants

Reaction Steps

380.4 g of (R)-1-cyclopropyl-8-difluoromethoxy-7-(1-methyl-2,3-dihydro-1H-5-isoindolyl)-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid methanesulfonate monohydrate, 83.1 g of lactose, 36 g of corn starch and 27 g of carboxymethyl starch sodium (Primojel, Matsutani Kagaku) are mixed, and the mixture is thereafter introduced into a kneader (small size bench kneader, Koike Tekko) and then kneaded while 180 g of a 6% aqueous hydroxypropyl cellulose solution (HPC-L, Nippon Soda) is gradually added. The kneaded product is subjected to size reduction by a power mill (PS-04S, Dalton, 2-mm herringbone screen) and then dried by blowing air at 40° C. overnight. After the drying, the product is subjected to size reduction by a power mill (20-mesh square screen), and thereafter, 2.7 g of magnesium stearate is added thereto and mixed therewith to prepare a powder for tableting. This powder is tableted by a rotary type tablet machine (HP-18, Hata Tekko) using a punch having a diameter of 7.5 mm so that the weight of one tablet becomes 180 mg to obtain tablets each containing 100 mg of (R)-1-cyclopropyl-8-difluoromethoxy-7-(1-methyl-2,3-dihydro-1H-5-isoindolyl)-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid (as free base). This tablet is subjected to film coating in an aqueous system by conventional procedure (4 mg of hydroxypropylmethyl cellulose (TC-5), 0.8 mg of Macrogol 6000, 0.4 mg of titanium oxide and 0.4 mg of talc per tablet) to obtain a film-coated tablet.

Provenance & Evidence