Cesium carbonate → Racemic tert-butyl 4-(2-(2,6-dimethylphenyl)-6-(5-isopropyl-2-methylphenyl)-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-(2-(2,6-dimethylphenyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-yl)-(trans)-2,5-dimethylpiperazine-1-carboxylate (0.187 g, 0.414 mmol) in THF (4 mL) was added 5-isopropyl-2-methylphenyl trifluoromethanesulfonate (0.175 g, 0.620 mmol) prepared as described in Example 15, Cs2CO3 (0.404 g, 1.24 mmol) and chloro(2-dicyclohexylphosphino-2′-4′-6′-triisopropyl-1,1′-biphenyl)[2-(2-aminoethyl)phenyl]palladium(II)-methyl-t-butylether adduct (0.046 mg, 0.062 mmol). The reaction was purged with argon and was heated at 130° C. for 3 h in a microwave reactor. The mixture was then concentrated and the residue was purified via FCC (10-35% EtOAc/heptane) to give racemic tert-butyl 4-(2-(2,6-dimethylphenyl)-6-(5-isopropyl-2-methylphenyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-yl)-(trans)-2,5-dimethylpiperazine-1-carboxylate. MS (ESI+) m/z 584.4 (M+H)+.

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