Br[CH2:2][C:3]([C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1)=O.[S-:11][C:12]#[N:13].[K+].CN(C=[O:19])C>[I-].[K+]>[C:5]1([C:3]2[NH:13][C:12](=[O:19])[S:11][CH:2]=2)[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1A suspension of 2-bromoacetophenone (5 g, 0.0251 mol), potassium thiocyanate (8.6 g, 0.088 mol) and potassium iodide (0.25 g, 0.0015 mol) in dry DMF (25 mL) was heated to 80° C. for 2 h. The reaction mixture was concentrated to dryness under reduced pressure and the residue was dissolved in glacial acetic acid (25 mL) and 50% aqueous H2SO4 was added to it. The reaction mixture was heated to 100° C. for 10 min. The reaction mixture was poured in ice water and the precipitate formed was filtered and dried under reduced pressure to get 4-phenylthiazol-2(3H)-one (3.3 g, yield 75%) as brown solid, which was carried through without further purification.
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