Ammonium Chloride → (S)-3-(4-Bromophenyl)-1-(2-methoxypyrimidin-5-yl)-3-o-tolylpropan-1-one

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Reaction Steps

A solution of n-butyllithium (1.6 M in hexane, 3.31 mL, 5.3 mmol) in tetrahydrofuran (12 mL) was cooled to −95° C. and added dropwise, under nitrogen, to a stirred, cooled (−95° C.) solution of 5-bromo-2-methoxypyrimidine (1.00 g, 5.3 mmol) in dry tetrahydrofuran (40 mL). To the resulting yellow solution was immediately added a solution of (S)-3-(4-bromophenyl)-N-methoxy-N-methyl-3-o-tolylpropanamide (example 142, step 1; 1.6 g, 4.42 mmol) in dry THF (12 mL), with the temperature of the reaction mixture being kept between −90° C. and −100° C. The solution was stirred and allowed to warm to room temperature over 2 h. The reaction mixture was poured onto sat. aq. ammonium chloride solution and extracted with ethyl acetate. The organic layer was washed with brine dried over magnesium sulfate, filtered, and evaporated. Chromatography (SiO2; heptane-ethyl acetate gradient) produced the title compound (700 mg, 35%), Colourless gum, MS (ESI+): m/z=: 411.2 [M+H]+.

Provenance & Evidence