The reaction of thioamides (1) with various haloacyl halides (2, 7, 11, 14, 17, and 19) was carried out in sat. NaHCO3-CH2Cl2 and 5% NaOH-CH2Cl2 to give several kinds of 4-thiazolones (3-5, 10, 12 and 15), thiazin-4-one (18) and spiro compounds (21).