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N-(2,2-Dichloro-2-phenylethylidene)-4-chlorobenzenesulfonamide reacts with 2-aminothiazoles to give products of nucleophilic addition in good yields. The adducts are cyclized into the unexpected 5-(arylsulfonyl)amino-6-phenylimidazo(2,1-b)thiazoles in 70-75% yield; whereas the anticipated isomeric 6-(arylsulfonyl)amino-5-phenylimidazo(2,1-b)thiazoles were not observed.

One-pot regioselective synthesis of new 5-(arylsulfonylamino)imidazo[2,1-b]thiazoles