3,5-Bis(trifluoromethyl)benzyl bromide → 2''-Methyl-5-(4-methyl-piperazin-1-yl)-biphenyl-2-carboxylic acid (3,5-bis-trifluoromethyl-benzyl)-methyl-amide

Participants

Reaction Steps

To a solution of 50 mg (0.15 mmol) 2′-methyl-5-(4-methyl-piperazin-1-yl)-biphenyl-2-carboxylic acid methylamide in 2 ml THF 0.2 ml of a 1 M solution (0.2 mmol) of potassium hexamethyldisilazide in THF was added at 0°. After 20 min. 0.028 ml (0.15 mmol) 3,5-bis(trifluoromethyl)benzyl bromide was added dropwise to the resulting suspension. The reaction was quenched with water after 1.5 h. The mixture was diluted with 5 ml 2 N NaOH solution and extracted with 3 5-ml portions of ethyl acetate. The combined organic extracts were dried (Na2SO4) and evaporated. Chromatography (SiO2, CH2Cl2/methanol 19:1) gave 25 mg (29%) 2′-Methyl-5-(4-methyl-piperazin-1-yl)-biphenyl-2-carboxylic acid (3,5-bis-trifluoromethyl-benzyl)-methyl-amide, MS (ISP): 550.5 (M+H)+.

Provenance & Evidence