Ammonia → 1,1-Diethyl,3-(2,6,13-trimethyl-8alpha-ergolinyl)-thiourea

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Reaction Steps

0.5 M1 of freshly distilled phosphorus oxychloride (5.6 mmol) and 368 mg of 1,1-diethyl-3-(2,6,13-trimethyl-8alpha- ergolinyl)-urea (1 mmol) are dissolved in 20 ml of dichloromethane at -20° C. and the mixture is allowed to stir overnight at room temperature. The volatile portions are now drawn off in a vacuum, the residue is dissolved in 40 ml of acetonitrile and mixed with a solution of 0.8 g of potassium xanthate (5.6 mmol) in 80 ml of acetonitrile. It is stirred for 2 hours at room temperature, then ice and conc. ammonia solution are added and shaken out with dichloromethane. The organic phases are dried with sodium sulfate and concentrated by evaporation, the residue is chromatographed on silica gel with ethyl acetate and crystallized from ethyl acetate/diisopropyl ether, yield 43%.

Provenance & Evidence