2-Aminothiazole → 2-[([[(2-Phenoxyanilino)sulfonyl]amino]carbonyl)amino]thiazole

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To a solution of chlorosulfonyl isocyanate (0.22 ml, 2.5 mmol) in tetrahydrofuran (25 ml) were added 2-phenoxyaniline (0.37 g, 2.0 mmol) and DIEA (0.89 ml, 5.0 mmol) at −78° C. The solution was stirred and slowly allowed to warmed up to 0° C. To this reaction mixture, was added 2-amino thiazole (0.20 g, 2.0 mmol) and continued stirring at room temperature for 3 h. The reaction mixture was concentrated under reduced pressure and the crude product was purified by column chromatography (ethylacetate:hexanes, from 50:50 to 90:10 as eluent system) to afford the title compound (0.52 g, 66%).

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