Methanesulfonic Acid → 4-ethyl-N-[3-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]pyrimidin-2-amine

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Reaction Conditions

Reaction Steps

A solution of 2-chloro-4-ethyl pyrimidine (0.98 g, 7.00 mmol), the product of Step 1 (1.794 g, 7.70 mmol), and methanesulfonic acid (0.50 mL, 7.70 mmol) in 1,4-dioxane (30 mL) was sealed in a 100 mL screw-top pressure flask and heated at 110° C. for 15 hours. The flask was cooled, an additional portion of 2-chloro-4-ethyl pyrimidine (0.145 g, 1.05 mmol) was added, and the flask was resealed and heated for another 6.5 hours. The reaction mixture was cooled, diluted with ethyl acetate (70 mL), washed with saturated aqueous sodium bicarbonate solution (25 mL) and brine (25 mL), dried over sodium sulfate, filtered, and concentrated. The resulting reddish brown solid 4-ethyl-N-[3-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]pyrimidin-2-amine (3.44 g as a 80:20 w/w mixture with 1,4-dioxane) was used without further purification. MS ESI: [M+H]+ m/z 340.1

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