Ethyl isocyanate → 2,6-Dichloro-4-[2-(3-ethyl-ureido)-4-methyl-thiazol-5-yl]-benzenesulfonamide

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Reaction Steps

Ethyl isocyanate (0.015 ml, 0.19 mmol) is added to a stirred solution of 4-(2-amino-4-methyl-thiazol-5-yl)-2,6-dichloro-benzenesulfonamide (Example 26) (0.043 g, 0.127 mmol) in dry dimethylformamide (1.0 ml) under argon. After heating at 85° C. for 3 hours more ethyl isocyanate (0.015 ml, 0.19 mmol) is added and heating continued for a further hour. The reaction is concentrated in vacuo and the product is purified by chromatography on silica eluting with ethyl acetate—hexane (1:1 increasing to 4:1) to give the title compound. MH+ (TOF, MS, ES+): 408.9, 410.9, 412.8

Provenance & Evidence