Dimethylformamide → 2,2,2-trifluoro-N-(4-formyl-3,5-dimethylphenyl)acetamide

Participants

Reaction Conditions

Reaction Steps

To a solution of N-(4-bromo-3,5-dimethylphenyl)-2,2,2-trifluoroacetamide (U.S. Pat. No. 6,391,865) (14.0 g. 47.3 mmol) in THF (200 mL) under nitrogen atmosphere at −78° C. was added slowly methyllithium/LiBr (44.1 mL of a 1.5 M solution in Et2O, 66.2 mmol). After 5 min of stirring, sec-BuLi (47.3 mL of a 1.4 M solution in cyclohexane, 66.2 mmol) was added slowly to the reaction solution at −78° C. After 5 min, anhydrous DMF (25.5 mL, 331 mmol) was added slowly then the solution was warmed to 25° C. After 30 min the reaction mixture was quenched with water. The aqueous layer was extracted with CH2Cl2 and the combined organic layers were washed with water, brine, dried over MgSO4 and filtered. The solvent was removed under reduced pressure to give the title compound as a yellow solid. MS: m/z 246 (M+1).

Provenance & Evidence