Triethylamine → (S)-7-(3-aminopiperidin-1-yl)-1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

Participants

Reaction Steps

A suspension of (S)-3-aminopiperidine (4.0 g) obtained as described in the step (c) above 1-cyclopropyl-6,7,8-trifluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid(11.4 g) and triethylamine (8.4 g) in acetonitrile (250 ml) was refluxed for 3 hours with stirring. Then the mixture was cooled down and filtrationof the precipitated powder followed by treatment with a mixture of ethanol (550 ml) and water (250 ml) gave (S)-7-(3-aminopiperidin-1-yl)-1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (11.6 g) as colorless needles. m.p. 247.8° C. (decomposition).

Provenance & Evidence