反应详情

8-(3-Diethylamino-1-azetidinyl)-3-ethoxy-carbonyl-7-fluoro-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine was prepared under the conditions of Example 2, but starting with 2 g of 3-ethoxy-carbonyl-7,8-difluoro-1-methyl-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine and 1.4 g of 3-(diethylamino)-azetidine dihydrochloride. After recrystallization of the crude product in 500 cm3 of methanol, 2.07 g of 8-(3-diethylamino-1-azetidinyl)-3-ethoxy-carbonyl-7-fluoro-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine are obtained in the form of a yellow solid, melting point 260° C.

1. customAfter recrystallization of the crude product in 500 cm3 of methanol, 2.07 g of 8-(3-diethylamino-1-azetidinyl)-3-ethoxy-carbonyl-7-fluoro-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine
2. customare obtained in the form of a yellow solid, melting point 260° C.