1,4-Dioxane → N-[2-(6,7-Dimethoxyquinazolin-4-ylamino)-benzothiazol-6-yl]-4-trifluoromethoxybenzamide

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Reaction Steps

N-[2-(6,7-Dimethoxyquinazolin-4-ylamino)-benzothiazol-6-yl]-4-trifluoromethoxybenzamide was prepared from 4-chloro-6,7-dimethoxyquinazoline (44.9 mg, 0.2 mmol) and N-(2-aminobenzothiazol-6-yl)-4-trifluoromethoxybenzamide (Intermediate 2, 71 mg, 0.2 mmol) according to GP 1. Dimethylformamide was used as a solvent instead of dioxane. After removal of the solvent in vacuo, the residue was subjected to silica gel chromatography applying a dichloromethane-methanol gradient. The product was then further purified by recrystallisation from dichloromethane (3 mL) to obtain a yellow solid (10 mg, 19 μmol, 9%). LC/ESI-MS: m/z=542 [M+H]+; m/z=540 [M−H]−; Rt=3.87 min.

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