Hydrogen Peroxide → HCID 66817774, compound

Participants

Reaction Steps

A 1 N aqueous NaOH solution (0.274 ml, 0.274 mmol) and a 35% aqueous H2O2 solution (0.051 ml, 0.52 mmol) were added to a solution of 4-cyano-4-[(2,2-difluoro-benzo[1,3]dioxole-4-carbonyl)-amino]-piperidine-1-carboxylic acid tert-butyl ester (56.0 mg, 0.137 mmol) in THF (0.23 ml) at room temperature. The reaction mixture was stirred at room temperature for 43 hours, and a 35% aqueous H2O2 solution (0.030 ml, 0.31 mmol) was then further added at room temperature. After stirring at room temperature for 48 hours, the mixture was quenched with a 1 N aqueous HCl solution (0.2 ml) and concentrated under reduced pressure. A 6 N aqueous NaOH solution (0.33 ml, 2.0 mmol) was added to a suspension of the resulting residue in EtOH (1.2 ml) at room temperature, and the mixture was stirred at room temperature for 24 hours. The reaction mixture was quenched with a saturated aqueous NH4Cl solution (0.4 ml) and then concentrated under reduced pressure. The resulting residue was dissolved in ethyl acetate and washed with water, and then dried over MgSO4 and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=3/2) to give 2-(2,2-difluoro-benzo[1,3]dioxol-4-yl)-4-oxo-1,3,8-triaza-spiro[4.5]dec-1-ene-8-carboxylic acid tert-butyl ester (51.2 mg, 91%).

Provenance & Evidence