Trimethylsilyl triflate → HCID 55273007, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 2-(3-vinyl-phenyl)-piperidine-1-carboxylic acid tert-butyl ester (650 mg, 2.26 mmol) in dichloromethane (15 mL) was cooled to 0° C., before adding trimethylsilyl trifluoromethanesulfonate (569 μL, 3.39 mmol). The reaction mixture was stirred at 0° C. for 1 h before adding N,N-diisopropylethylamine (1.6 mL, 5.24 mmol) to afford the 2-(3-vinyl-phenyl)-piperidine as a yellow solid. The solid was redissolved, along with 28f (900 mg, 1.98 mmol) in acetonitrile (20 mL). The solution was cooled to 0° C., before adding 2-(1H-7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyl uronium hexafluorophosphate methanaminium (1.05 g, 2.77 mmol) and N,N-diisopropylethylamine (1.4 mL, 7.92 mmol). The stirred reaction mixture was allowed to slowly warm to RT. After 2 h, the solvent was evaporated and the remaining residue dissolved in ethyl acetate (30 mL) and washed with water (3×30 mL). The organics were dried over anhydrous sodium sulfate, filtered and concentrated. The resultant residue was purified by silica gel chromatography using a stepwise gradient of iso-hexanes/ethyl acetate 1:0 to 0:1 to afford the title compound (1.25 g, 100%) as a yellow solid.

Provenance & Evidence