反应详情

tert-Butyl 3,9-diazaspiro[5.5]undecane-3-carboxylate (1 g, 3.931 mmol), 4-chloropyridinium chloride (1.765 g, 11.794 mmol) and triethylamine (2.2 ml, 15.725 mmol) were refluxed in 1-butanol (50 ml) for 15 h. Saturated sodium bicarbonate solution (30 ml) and ethyl acetate (80 ml) were added, the phases were separated and the aqueous phase was extracted with ethyl acetate (2×80 ml). The combined organic phases were dried over magnesium sulfate and concentrated in vacuo. The crude product was purified by column chromatography (silica gel) with ethyl acetate/hexane/methanol/ammonia (25% aq) 400/40/40/1. Yield: 0.52 g (39%)

1. customthe phases were separated
2. extractionthe aqueous phase was extracted with ethyl acetate (2×80 ml)
3. dry with materialThe combined organic phases were dried over magnesium sulfate
4. concentrationconcentrated in vacuo
5. customThe crude product was purified by column chromatography (silica gel) with ethyl acetate/hexane/methanol/ammonia (25% aq) 400/40/40/1