4-Chloro-2-fluorophenyl isocyanate → 3-Carbethoxy-4-(4-chloro-2-fluorophenylaminocarbonyl)thiomorpholine

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Reaction Steps

An emulsion of 14 g of 3-carbethoxythiomorpholine in 50 ml of n-hexane was added dropwise to a solution of 14 g of 4-chloro-2-fluorophenylisocyanate in 60 ml of anhydrous ether at 15° to 28° C. with stirring. A heavy oil formed after the addition. The oil crystallized after stirring at room temperature for 15 min. The precipitate was collected by filtration to give 24.3 g of 3-carbethoxy-4-(4-chloro-2-fluorophenylaminocarbonyl)thiomorpholine, m.p. 111.5°-112.5° C.

Provenance & Evidence