(4-Chlorophenyl)thioacetic acid morpholide (II) was prepared by Willgerodt-Kindler reaction of 4'-chloroacetophenone (I) with sulfur and morpholine. Subsequent condensation of (II) with triethyl orthoformate and morpholine provided the 3-(4-morpholinyl)thioacrylic acid morpholide (IIIa-b). Finally, ring closure of (IIIa-b) with hydrazine hydrochloride in refluxing EtOH furnished the title pyrazole.