Triethylamine → 8-(Pyridin-4-yl)-1,4-dioxa-8-azaspiro[4.5]decane

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Reaction Steps

A mixture of 1,4-dioxa-8-azaspiro[4.5]decane (150 g), 4-chloropyridine hydrochloride (190 g) and triethylamine (320 g) in ethanol (800 ml) was reacted in a sealed tube at 150° C. for 15 hours. The reaction mixture was concentrated to obtain a residue, which was made alkaline by an addition of a 6N aqueous solution of sodium hydroxide, and then extracted with dichloromethane. After drying and concentrating, the resultant residue was triturated from hexane, collected by filtration and then dried to obtain 8-(4-pyridyl)-1,4-dioxa-8-azaspiro[4.5]decane (172 g) as a pale yellow solid.

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