C(OC(=O)[NH:7][C:8]1[S:9][C:10]([S:15][CH3:16])=[C:11]([CH2:13][CH3:14])[N:12]=1)(C)(C)C>Cl>[CH2:13]([C:11]1[N:12]=[C:8]([NH2:7])[S:9][C:10]=1[S:15][CH3:16])[CH3:14]The above prepared (4-ethyl-5-methylsulfanyl-thiazol-2-yl)-carbamic acid tert-butyl ester (1.067 g, 3.888 mmol) was treated with 20 mL of HCl (4 M in dioxane). After 48 h at RT the reaction mixture was evaporated to dryness and, since still some starting material was present, the procedure repeated, but this time the temperature was raised to 30° C. Careful evaporation and drying left 0.814 g of the title compound as hydrochloride.
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