反应详情

The 1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-8-(4-methyl---piperazinyl)-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine was prepared under the conditions of Example 35 but starting from 1.5 g of 1-cyclopropyl-3-ethoxycarbonyl-7,8,9-trifluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine and 3 g of 1-methylpiperazine. methylpiperazine. 1.5 g of 1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-8-(4-methyl-1-piperazinyl)-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine are obtained in the form of a yellow solid melting at 230° C.