Diethyl Ether → 3-Ethoxycarbonyl-5-(4-trifluoromethyl-3-pyridyl)-1,2,4-oxadiazole

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Reaction Steps

20 g of ethyl 2-amino-2-(4-trifluormethyl-3-pyridinecarbonyloxyimino)-acetate are dissolved in 200 ml of a mixture of xylene and toluene and admixed with 5 g of Amberlyst 15. The mixture is boiled at 125-130° C. for 6 h using a Dean-Stark apparatus. After the reaction has ended, the mixture is cooled and admixed with a small amount of diethyl ether. The mixture is filtered with suction through a glass filter frit, and the solution is then concentrated. This gives 15.8 g of the product as a yellow oil.

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