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An improved synthesis of 2-ethyl-5-(2-hydroxy-4-oxoquinolin-3(4 H )-ylidene)-6-aryl-5,6-dihydroimidazo[2,1- b ][1,3,4]thiadiazol-7-ium hydroxide derivatives  4a–k  via the reaction of aryl glyoxal monohydrates  1a–k , quinoline-2,4-diol  2  and 2-amino-[1,3,4]thiadiazole  (3)  in the presence of Et 3 N/sulfamic acid in H 2 O is described. This green protocol is characterized by the use of the readily available catalyst and reactants, short reaction times, operational simplicity and high yields of products. The structures of all compounds were characterized by  1 H NMR,  13 C NMR and Fourier-transform infrared (FT-IR) spectral data and microanalyses.

An efficient synthesis of imidazo[2,1- b ][1,3,4]thiadiazol-7-ium hydroxides by a one-pot, three-component reaction in water