90533-23-6

17356-08-0

99-02-5

90533-23-6

The reaction mixture was stirred at 100 °C for 8 hours with thiourea (50 mmol), 3-chloroacetophenone (25 mmol) and iodine (25 mmol). After completion of the reaction, the mixture was cooled and extracted with ether to remove unreacted 3-chloroacetophenone. Subsequently, it was washed with aqueous sodium thiosulfate to remove excess iodine and then with cold water. The crude product was dissolved in hot water and filtered to remove the sulfone by-product. The filtrate was alkalized with aqueous Na2CO3 to afford 2-amino-4-(3-chlorophenyl)-1,3-thiazole. Finally, the crude product was purified by recrystallization from alcohol.