Potassium Phosphate, Tribasic → [4-(3-Chloropyrazin-2-yl)phenyl]acetic acid

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To a solution of 0.10 g (0.38 mmol) [4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]acetic acid in 1.2 ml of dioxane was added 0.17 g (1.15 mmol) of 2,3-dichloropyrazine, 2.57 mg (0.009 mmol) of tricyclohexylphosphine, 3.5 mg (0.004 mmol) of Pd2(dba)3, and 0.51 ml (1.27 M, 0.65 mmol) of aqueous potassium phosphate solution. The resulting suspension was degassed for 10 minutes. After 30 min in the microwave at 100° C., the reaction mixture was cooled, acidified with 1N HCl, extracted with ethyl acetate, and washed with brine. The organic layer was dried over Na2SO4, filtered and concentrated in vacuo to afford crude [4-(3-chloropyrazin-2-yl)phenyl]acetic acid. ES-MS M+1=249.1.

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