Sodium hydride → tert-Butyl[2-({1-[1-(4-fluorophenyl)cyclobutyl]-3,4-dihydroisoquinolin-7-yl}oxy)ethyl]carbamate

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Reaction Steps

Sodium hydride (0.626 g, 15.64 mmol, 60% suspension in mineral oil) was washed under dry conditions under nitrogen atmosphere with n-hexane. Dimethylformamide (20 mL) was added followed by 1-[1-(4-fluorophenyl)cyclobutyl]-3,4-dihydroisoquinolin-7-ol (2.1 g, 7.11 mmol) under stirring. After the exothermic reaction had ceased stirring was continued at room temperature for 1 h before tert-butyl (2-bromoethyl)carbamate (4.78 g, 21.33 mmol) was added dropwise as a solution in dimethylformamide (10 mL). The reaction mixture was stirred at room temperature over night. The solvent was evaporated in vacuo. Ice water was added (60 mL) and the aqueous phase was extracted with ethyl acetate. The combined organic layers were dried (MgSO4) and the solvent was evaporated in vacuo. The crude product was purified by flash chromatography (silica, dichloromethane:methanol=100:1). Yield: 2.5 g (5.7 mmol, 36%).

Provenance & Evidence