Potassium Nitrate → Ethyl 1-cyclopentyl-6,7-difluoro-8-methoxy-5-nitro-1,4-dihydro-4-oxoquinoline-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of 15 (6.1 g, 17.4 mmol) in concentrated H2SO4 (60 mL) was treated portionwise at 0° C. with solid KNO3 (2.64 g, 26 mmol). After stirring at 0° C. for 1 h, the reaction mixture was poured into 500 mL of ice-water and the resulting precipitate was removed by filtration, washed with water and dissolved in CH2Cl2. The resulting solution washed with 5% NaHCO3, dried and evaporated to yield 16 as a yellow solid (6.0 g, 87%).

Provenance & Evidence