3-Bromoaniline → N-3,3-Dimethylacryloyl-3-bromoaniline

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To a suspension of NaH (4.15 g, 173 mmol, 60% in oil) in 50 ml of THF was cannulated a solution of 20.322 g (118 mmol) of 3-bromoaniline in 50 ml of THF. The resulting mixture was stirred at 0° C. for 45 min and warmed to room temperature over a period of 15 min. To this solution was added through cannulation 13.123 g (173 mmol) of 3,3-dimethylacryloyl chloride. The mixture was stirred at room temperature for 24 h and thereafter slowly poured into ice water. The resulting mixture was extracted with methylene chloride (twice), dried over MgSO4 and concentrated to yield a solid. The solid was purified by recrystallization in hexane/EtOAc (2:1) to give the title compound as a light brown solid.

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