反应详情

To a cold (-78° C.) solution of ethyl N-tert-butoxycarbonyl-piperidine-4-carboxylate (5.1 g, 19.8 mmol; Example 30, Step A) in anhydrous THF (50 mL), a solution of solution of sodium bis(trimethylsilyl)amide (20 mL, 1M, 20 mmol) was added over a period of 15 min. The resultant mixture was stirred at -78° C. for 1 h., and 2-chloromethyl-4-methylpyridine (3.5 g, 24.7 mmol) was added. The reacting mixture was allowed to warm to room temp. and stirred overnight. The product mixture was diluted with dichloromethane was washed with brine. The organic extract was dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The residue was subjected to column chromatography on silica gel eluting with 25-40% ethyl acetate in hexane gradient. Collection and concentration of appropriate fractions provided the title compound.

1. temperatureto warm to room temp.
2. washwas washed with brine
3. extractionThe organic extract
4. dry with materialwas dried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated under vacuum
7. customCollection and concentration of appropriate fractions