Hydrochloric Acid → (3S)-10-(cis-3-Amino-4-methyl-1-pyrrolidinyl)-9-fluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid hydrochloride

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Reaction Steps

A mixture of (3S)-10-(cis-3-t-butoxycarbonylamino-4-methyl-1-pyrrolidinyl)-9-fluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid (0.6 g) in ethanol (8 ml) and ethanolic hydrochloride solution (10 ml) was stirred for 1.5 hours at room temperature and then concentrated. To the residue was added ethanol and the resulting precipitate was collected by filtration to give the title compound (0.44 g) as yellowish powder, mp 285° C. (decompd.).

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