2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → HCID 58573923, compound

Participants

Reaction Steps

To a solution of 3.09 g (4.33 mmol) N—((S)-2-((3R,5R,6S)-3-allyl-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-(2-(4-methoxybenzyloxy)ethyl)-2-oxopiperidin-1-yl)butyl)-N-methylcyclopropanesulfonamide (Example 408, step C) in a mixture of DCM (82 mL) and water (4.56 mL) [18:1] was added 2,6-di-tert-butylpyridine (2.93 mL, 12.99 mmol) followed by DDQ (3.93 g, 17.32 mmol). The reaction mixture was stirred vigorously at ambient temperature for 15 min. The reaction mixture was diluted with 150 mL sat. NaHCO3/brine solution and extracted into 600 mL of ethyl acetate, then 200 mL of EtOAc×2 (precipitate was removed by filtration). The combined organic layers were dried over MgSO4, filtered and the filtrate was evaporated. Purification by chromatography on silica gel (eluent: 50-100%% EtOAc/hexane, gradient elution) provided the desired product as a foam.

Provenance & Evidence