1,3-Dichloro-2-propanol → Ethyl 1-cyclopropyl-6,8-difluoro-7-(3-hydroxy-1-azetidinyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylate

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Reaction Steps

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.

Provenance & Evidence