(6,7-Substituted-8-alkoxy-1-cyclopropyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid-O3,O4)bis(acyloxy-O)borates and the salts thereof, and methods for their manufacture

With the general formula (I) novel compound (6,7-propyl ether ring of n-substituted -8-dihydro -4-oxo-quinoline carboxylic acid-O3,O4) bis (acyloxy-o) boric acid and its salts and its hydrates and their methods of preparation, which is important in preparation of useful novel quinolone drug intermediates.