Potassium bis(trimethylsilyl)amide → 8-(cyclopentyloxy)-4-hydroxy-7-methoxyquinolin-2(1H)-one

Participants

Reaction Steps

A solution of methyl 2-acetamido-3-(cyclopentyloxy)-4-methoxybenzoate (6.42 g, 20.9 mmol) and anhydrous tetrahydrofuran (THF) (60 mL) was added via syringe pump (1 mL/min) to a solution of potassium bis(trimethylsilyl)amide (KHMDS) (150 mL, 0.5M PhMe, 75 mmol) at −78° C. under N2. The reaction was allowed to slowly warm to room temperature as the bath expired overnight. After 17, h, the reaction was poured into ice/water (250 mL), let stir for 10 min, and the layers were separated. The aqueous was washed with ether (150 mL), acidified with conc. HCl (7 mL), and filtered to give 8-(cyclopentyloxy)-4-hydroxy-7-methoxyquinolin-2(1H)-one: MS (ESI): 276.0.

Provenance & Evidence