Potassium Bromide → HCID 66580194, compound

Participants

Reaction Steps

To a solution of 8-hydroxy-2-[4-((S)-2,2,2-trifluoro-1-methyl-ethoxy)-phenyl]-2-aza-spiro[4.5]decan-1-one (5.79 g) and 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) (506 mg) in CH2Cl2 (85 mL) was added a solution of potassium bromide (482 mg) in water (16 mL). Then, sodiumhypochlorite (13%, 42.5 mL) was added dropwise over a period of 10 minutes, followed by sodium bicarbonate (NaHCO3) (4.08 g). The mixture was stirred for 1.5 hours at RT. TLC showed a remainder of starting material. More TEMPO (125 mg) and sodiumhypochlorite solution (10 mL) were added and the mixture was stirred for an additional 2 hours at RT. The reaction was poured into ice/water and was extracted three times with CH2Cl2. The combined organic layers were washed with brine, dried over Na2SO4 and filtered. The solvent was evaporated and the crude material was purified by flash chromatography (silica gel, gradient of heptane in ethyl acetate) to provide the title compound as a light brown solid (5.47 g). MS (m/e): 356.1 (MH+).

Provenance & Evidence