3-ethoxycarbonyl-1-cyclopropyl-7,8-difluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine 、 3-Aminoazetidine dimethanesulphonate 在
8-(3-amino-1-azetidinyl)-1-cyclopropyl-3-ethoxycarbonyl-7-fluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine 、
乙醇 作用下,
以1.05 g of 8-(3-amino-1-azetidinyl)-1-cyclopropyl-3-ethoxycarbonyl-7-fluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine are obtained in the form of a yellow solid, melting point 178°-180° C.的产率得到8-(3-amino-1-azetidinyl)-1-cyclopropyl-3-ethoxycarbonyl-7-fluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine