Triethylamine → 1-(6-Bromo-pyridin-2-ylmethyl)-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid methoxy-methyl-amide

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Reaction Steps

9.45 g (26.3 mmol) of 1-(6-bromo-pyridin-2-ylmethyl)-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid, 2.82 g (28.9 mmol) of N,O-dimethylhydroxylamine hydrochloride, 22 mL (16 g, 158 mmol) of triethylamine and 18.8 mL (20.1 g, 31.6 mmol) of 50% 1-propanephosphonic acid cyclic anhydride were sequentially added to 250 mL acetonitrile at rt. After 1 h 400 mL of water were added and the mixture was extracted two times with 300 mL DCM. Combined organic layers were evaporated and the residue purified on silica flash column using 0-15% methanol in EtOAc to give 9.62 g of the product as an off-white solid.

Provenance & Evidence