Hydrazine → (S)-2-{2-[6-amino-7-chloro-3-(3,5-dimethylphenyl)-2-oxo-1,2-dihydro-quinolin-4-yloxy]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a solution of (S)-2-{2-[7-chloro-3-(3,5-dimethylphenyl)-6-nitro-2-oxo-1,2-dihydroquinolin-4-yloxy]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester (Example 5, Step 5A: 750 mg in 13 mL dry methanol) was added 18 mg iron(III)chloride hexahydrate followed by 100 mg activated carbon and the mixture heated to reflux on an oil bath. After 15 minutes, hydrazine (0.169 mL) was added dropwise and the reaction allowed to proceed at reflux for 12 hours. At this time, the mixture was cooled to room temperature, filtered through diatomaceous earth and the solvent removed in vacuo. The concentrate was solvated in 400 mL methylene chloride, washed successively with water (100 mL) and brine (100 mL), dried over sodium sulfate and concentrated in vacuo to give the title compound (crude: 710 mg).

Provenance & Evidence