p-Toluenesulfonic acid → 4-[4-Fluoro-2-(tetrahydro-pyran-4-yloxy)-phenylamino]-5-methyl-thieno[2,3-d]pyrimidine-6-carboxylic acid methylester

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Reaction Steps

4-Fluoro-2-(tetrahydro-2H-pyran-4-yloxy)aniline (3.47 g, 16.4 mmol), methyl 4-chloro-5-methylthieno[2,3-d]pyrimidine-6-carboxylate (3.99 g, 16.4 mmol) and para-toluene sulfonic acid (0.313 g, 1.64 mmol) were heated at reflux in anhydrous 1,4-dioxane (30 mL) for 1.5 hours. The solution was cooled to ambient temperature, the precipitate collected and washed with cold 1,4-dioxane to yield the title compound as yellow solid (6.17 g, 90%).

Provenance & Evidence