Sodium Carbonate → Racemic tert-Butyl 4-(6-benzyl-2-(2,6-dimethylphenyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-yl)-(trans)-2,5-dimethylpiperazine-1-carboxylate

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To a solution of racemic tert-butyl 4-(6-benzyl-2-chloro-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-yl)-(trans)-2,5-dimethylpiperazine-1-carboxylate (0.54 g, 1.14 mmol) in DME (9 mL) was added 2,6-dimethylphenylboronic acid (0.257 g, 1.72 mmol), Pd(Ph3P)4 (0.198 g, 0.172 mmol) and a 2 M aq solution of sodium carbonate (1.9 mL). The reaction was heated at 140° C. in a microwave reactor for 1.75 h. The reaction was filtered and diluted with EtOAc and brine. The organic layer was separated and then dried (Na2SO4), filtered and concentrated. The residue was then purified by FCC (55-80% EtOAc/heptane) to give the title compound. MS (ESI+) m/z 542.5 (M+H)+.

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