Water → HCID 11197062, compound

Participants

Reaction Steps

To a solution of N-(3,5-dimethoxyphenyl)-2,2,2-trifluoroacetamide (31.8 g, 130 mmol) in anhydrous methylene chloride (450 mL), cooled in an ice bath, is added a solution of tin (IV) chloride (29.9 mL, 260 mmol dissolved in 30 mL anhydrous methylene chloride) dropwise over 10 minutes. Acetyl chloride (9.1 mL, 130 mmol) is added slowly, maintaining the temperature of the reaction below 5° C. After stirring 3 hours at room temperature, the reaction is cooled in an ice bath. Water (300 mL) is added, maintaining the temperature of the reaction below 25° C., and the reaction is stirred at room temperature for 18 hours. The reaction mixture is extracted with methylene chloride, and the organic layer is separated, washed with water, dried, filtered and evaporated under reduced pressure. The residue is purified by silica gel column chromatography eluting with 20% to 30% hexanes/ethyl acetate to yield N-(4-acetyl-3,5-dimethoxyphenyl)-2,2,2-trifluoroacetamide (4.8 g, 13%) as a white solid.

Provenance & Evidence