Potassium Phosphate, Tribasic → Methyl 2-(4'-(6-carbamoyl-3,5-dimethylpyrazin-2-yl)-2-chloro-2'-fluorobiphenyl-4-yl)propanoate

Participants

Reaction Conditions

Reaction Steps

A solution of 4-(6-carbamoyl-3,5-dimethylpyrazin-2-yl)-2-fluorophenyl trifluoromethanesulfonate (Intermediate 6-4; 703 mg, 1.79 mmol) and methyl 2-(3-chloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propanoate (Intermediate 8-2; 580 mg, 1.79 mmol), lithium chloride (133 mg, 3.13 mmol) and potassium phosphate, tri-basic (455 mg, 2.14 mmol) in DME (20 mL), methanol (10 mL) and water (5 mL) was thoughroughly degassed. The mixture was treated with PdCl2(dppf)-DCM adduct (73.0 mg, 0.09 mmol), degassed again and the atmosphere replaced with nitrogen before being heated to 85° C. for 17 hours. The reaction mixture was allowed to cool and evaporated, the residue was partitioned between EtOAc (100 mL), and water (75 mL) and the aqueous layer was further extracted with EtOAc (100 mL). The organic layers were combined and washed with saturated brine (100 mL), dried over MgSO4, filtered and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 0 to 60% EtOAc in isohexane. Pure fractions were evaporated to dryness to afford methyl 2-(4′-(6-carbamoyl-3,5-dimethylpyrazin-2-yl)-2-chloro-2′-fluorobiphenyl-4-yl)propanoate (681 mg, 86%) as a cream solid.

Provenance & Evidence