Toluene → DL-5 Chloro-6-ethyl-4-[alpha-ethyl-4-(2,2-difluoropropoxy)benzyl]aminopyrimidine

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Reaction Steps

To a solution of 1.0 g of dl-5-chloro-6-ethyl-4-(α-ethyl-4-acetonyloxybenzyl)aminopyrimidine obtained in Example 17 dissolved in 50 ml of dried benzene was added 0.5 g of diethylaminosulfur trifluoride, and the mixture was refluxed by heating for 5 hours while stirring. After completion of the reaction, the mixture was poured into ice-cold water and extracted with ethyl acetate. The extract was washed with water, dried over anhydrous sodium sulfate and the solvent was distilled off under reduced pressure. The oily product obtained was isolated by column chromatography (Wako Gel C-200, trade name, eluted with toluene: ethyl acetate=7:1) to give 0.6 g of the desired product as pale yellow oily liquid.

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