Water → (5-Ethyl-2-morpholin-4-yl-cyclohex-2-enylidene)-acetic acid ethyl ester

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91.6 g of 4-Ethyl-cyclohexanone, 73.6 g of morpholine and 2 g of p-toluene-sulfonic acid monohydrate are dissolved in 400 ml of toluene. The mixture is heated to reflux and the water formed is removed by a water separator. After reacting for about 24 h, the reaction mixture is cooled to 100° C. and 2 g of p-toluene-sulfonic acid are added, followed by the addition of 157.22 g of glyoxylic acid ethyl ester during 30 minutes. The mixture is again heated to reflux for 5 hours and allowed to cool down to 22° C. The solvent is evaporated in vacuo and the crude product is distilled in vacuo at 140-150° C./9.5−2 mbar.

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