Chlorotrimethylsilane → 6-[[(1-Acetyl-2-pyrrolidinyl)-carbonyl]amino]-1,4-dihydro-4-oxo-quinolinecarboxylic acid

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Reaction Steps

A mixture of 7.07 g (45 mmol) of N-acetyl-L-proline, 5.85 ml (45 mmol) isobutyl chloroformate, 4.95 ml 45 mmol) N-methyl morpholine, and 90 ml of dichloromethane is stirred at -10° to -20° for 30 minutes. A mixture of 6.13 g (30 mmol) of 6-amino-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 12.6 ml (90 mmol) triethylamine, 11.4 ml (90 mmol) chlorotrimethylsilane, and 150 ml of dichloromethane is stirred at room temperature for 30 minutes and then is cooled to -20°. The cold mixed anhydride solution is added to the cold silylated quinoline and is stirred with cooling for 4 hours and at room temperature ovenight. The reaction mixture is evaporated to dryness and the residue is treated with 1 N hydrochloric acid and the solid is filtered. The solid is digested with ethanol and filtered to give 6.43 g of 6-[[(1-acetyl- 2-pyrrolidinyl)-carbonyl]amino]-1,4-dihydro-4-oxo-quinolinecarboxylic acid.

Provenance & Evidence