Pivaloyl chloride → HCID 58585365, compound

Participants

Reaction Conditions

Reaction Steps

0.66 ml of pivaloyl chloride are added dropwise to a suspension of 728 mg (1.18 mmol) of tert-butyl 4-[5-[(4′-hydroxy-1,1′-biphenyl-4-yl)oxy]-1-(4-methyl-phenyl)-6-oxo-1,6-dihydro-4-pyridazinyl]-1-piperazinecarboxylate (Example 46) and a catalytic amount of 4-DMAP in a mixture of dichloromethane (4.0 ml) and pyridine (0.4 ml) at room temperature. The heterogeneous reaction mixture is stirred at about 40° C. overnight. The slightly cloudy suspension is diluted with dichloromethane and washed with 0.2 N hydrochloric acid solution and saturated sodium chloride solution, dried over magnesium sulfate and concentrated. The crude product is purified by chromatography on silica gel.

Provenance & Evidence