ethyl 1-cyclopropyl-7,8,9-trifluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylate 、 3-Aminoazetidine dimethanesulphonate 在
8-(3-amino-1-azetidinyl)-1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine 、
乙醇 作用下,
以0.8 g of 8-(3-amino-1-azetidinyl)-1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine is obtained in the form of a yellow solid, melting point 236°-238° C.的产率得到8-(3-amino-1-azetidinyl)-1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine