Ammonia → 1-(7-Amino-5-pyridin-3-yl-benzothiazol-2-yl)-3-ethyl-urea

Participants

Reaction Conditions

Reaction Steps

A stirred suspension of 1-Ethyl-3-(7-nitro-5-pyridin-3-yl-benzothiazol-2-yl)-urea (25 mg, 0.0728 mmol) in ethanol (0.5 ml) and concentrated hydrochloric acid (0.5 ml) was treated with tin (II) chloride (69 mg, 0.364 mmol) and heated at 80° C. for 5 h. After cooling to ambient temperature, the mixture was diluted with water (50 ml) and made alkaline (pH 11) by the addition of concentrated ammonia. The 1-(7-Amino-5-pyridin-3-yl-benzothiazol-2-yl)-3-ethyl-urea was extracted with ethyl acetate (3×50 ml) which was dried (MgSO4) and the solvent removed in vacuo to give an off-white solid (37 mg) which was used without further purification.

Provenance & Evidence