反应详情

1,4-Dioxa-8-azaspiro[4.5]decane (10.0 g, 69.9 mmol, 1 eq) and 4-bromopyridine HBr (16.2 g, 83.7 mmol, 1.2 eq) were dissolved in n-butanol (120 ml) and DIPEA (23 ml, 139.8 mmol, 2.0 eq) and refluxed for 14 h. After monitoring by thin-layer chromatography, the reaction solution was concentrated under reduced pressure. After purification by column chromatography (silica gel, 3% MeOH in dichloromethane), the desired product was obtained in the form of a white solid. Yield: 58% (9.0 g, 40.9 mmol).

1. concentrationthe reaction solution was concentrated under reduced pressure
2. customAfter purification by column chromatography (silica gel, 3% MeOH in dichloromethane)