In a sealed vessel, heat a mixture of (S)-(2,4-dichlorobenzyl)-[1-(5-bromopyrimidin-2-yl)-pyrrolidin-3-yl]-amine (404 mg, 1.01 mmol), (trimethylsilyl)acetylene (250 μL, 1.76 mmol), dichlorobis(triphenylphosphine)palladium (II) (71.4 mg, 0.10 mmol), copper(I) iodide (20.7 mg, 0.11 mmol) and triethylamine (3 mL) at 100° C. for 4 hours. Cool to room temperature and dilute with water (30 mL). Filter through a pad of Celite®, washing with ethyl acetate. Extract the aqueous with additional ethyl acetate (3×50 mL) and wash the combined organics with saturated aqueous sodium chloride (50 mL). Concentrate and dissolve the residue in dichloromethane, filter, and concentrate to give a residue. Chromatograph the residue on silica gel to give (S)-(2,4-dichlorobenzyl)-[1-(5-trimethylsilanylethynylpyrimidin-2-yl)-pyrrolidin-3-yl]-amine as a yellow oil (337 mg, 80%).
