N-(4-Chloro-6-(4-fluorophenyl)pyrido[3,2-d]pyrimidin-2-yl)acetamide → 4-Ethyl-6-(4-fluorophenyl)pyrido[3,2-d]pyrimidin-2-amine

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Reaction Steps

A mixture of N-[4-chloro-6-(4-fluoro-phenyl)-pyrido[3,2-d]pyrimidin-2-yl]-acetamide (63 mg, 0.2 mmol; the synthesis of which has been disclosed in WO 2006/135993) and iron tris(acetylacetonate) (10 mg, 0.028 mmol) in THF (2 ml) and NMP (1 ml) was added ethylmagnesium bromide (0.6 ml, 0.6 mmol; 1.0 M solution in THF). After stirring at room temperature for 10 minutes, the solution was diluted with THF and quenched by adding a solution of 0.2 N HCl. The mixture was extracted with ethyl acetate, then dried over Na2SO4 and concentrated. The residue was dissolved in methanol (1 ml) and then sodium methoxide (0.2 ml; 0.5 N solution in methanol) was added. The mixture was heated to 120° C. for 10 minutes under microwave irradiation. Solvents were concentrated in vacuo and the residue was purified by HPLC using a C18 column with a gradient of H2O and 0.1% TFA-acetonitrile, to provide the pure title compound as a white solid (1 mg, yield: 2%) which was characterised by its mass spectrum as follows: MS (m/z) 269.0 [M+H]+; HPLC Rt=4.14 minutes (Method A).

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