4-Methoxybenzylamine → 2,2-difluoro-N-(4-methoxybenzyl)ethanamine

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Reaction Steps

An amount of 23.15 g (214 mmol) of 2,2-difluoro-1-chloroethane and 10 g (71 mmol) of 4-methoxybenzylamine are heated in an autoclave at an internal temperature of 120° C. for 16 hours. Subsequently, 50 g of water are added and the aqueous phase is separated. The aqueous phase is again extracted with 2,2-difluoro-1-chloroethane and the combined organic phases are distilled as described in Example 1.1. Here also, the 4-methoxybenzylamine hydrochloride present in the aqueous phase can be converted back into free 4-methoxybenzylamine by addition of sodium hydroxide solution. After distillation, 4.93 g of 2,2-difluoro-N-(4-methoxybenzyl)ethanamine are obtained, which corresponds to a yield of 68%, based on reacted 4-methoxybenzylamine.

Provenance & Evidence