反应详情

A solution of 0.8 g (2.60 mmoles) of ethyl 7-amino-1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylate, 0.33 g (2.60 mmoles) of 1,3-dichloro-2-propanol and 25 ml of pyridine is agitated for 3 days, protected from light at ambient temperature; then left refluxing for 3 days and more. The solution is concentrated almost to dryness, poured onto water giving a precipitate which is filtered and washed with water. The solid is dried under vacuum, yielding 0.52 g (55%) of ethyl 1-cyclopropyl-6,8-difluoro-7-(3-hydroxy-1-azetidinyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylate. Its melting point and spectroscopic data are identical to those of the derivative obtained according to method A.

1. customprotected from light at ambient temperature
2. waitthen left
3. temperaturerefluxing for 3 days
4. concentrationThe solution is concentrated almost to dryness
5. additionpoured onto water giving a precipitate which
6. filtrationis filtered
7. washwashed with water
8. customThe solid is dried under vacuum