Potassium Phosphate, Tribasic → 4-{4-(3-chloro-4-fluoro-phenyl)-6-[4-(3-trifluoromethyl-pyridin-2-yl)-piperazin-1-yl]-pyrimidin-2-yl}-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

Heat a solution of 2-chloro-4-(3-chloro-4-fluoro-phenyl)-6-[4-(3-trifluoromethyl-pyridin-2-yl)-piperazin-1-yl]-pyrimidine (774 mg, 1.64 mmol), 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (608 mg, 1.97 mmol (prepared essentially as described by Eastwood (2000) Tetrahedron Letters 41 (19):3705-3708), K3PO4 (2M, 1.64 mL) and Pd(PPh3)4 (76 mg, 0.07 mmol) in dioxane at 80° C. for 16 hours. Partition the reaction mixture between brine and EtOAc, dry the EtOAc layer (Na2SO4) and concentrate under reduced pressure. Flash chromatography (30% EtOAc in hexanes as eluent) yields 4-{4-(3-chloro-4-fluoro-phenyl)-6-[4-(3-trifluoromethyl-pyridin-2-yl)-piperazin-1-yl]-pyrimidin-2-yl}-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester as a foam.

Provenance & Evidence