反应详情

To a solution of 5-bromo-2-(1-hydroxy-1-methylethyl)pyridine from Step 1 in methylene chloride (5 ml/mmol) at room temperature was added m-chloroperoxybenzoic acid 70% (1.1 eq) and the resulting mixture was stirred at room temperature for 18 hours. An excess of calcium hydroxide was added and after 5 minutes the mixture was filtered through a bed of celite. The crude product from evaporation of the filtrate was chromatographed on silica gel eluting with 80% ethyl acetate in hexane and the 5-bromo-2-(1-hydroxy-1-methylethyl)pyridine N-oxide compound was obtained as a white solid.

1. filtrationwas filtered through a bed of celite
2. customThe crude product from evaporation of the filtrate
3. customwas chromatographed on silica gel eluting with 80% ethyl acetate in hexane