Potassium Carbonate → E-5-(2-Bromovinyl)-2,4-dimethoxypyrimidine

Beteiligte Stoffe

Reaktionsschritte

To a solution of E-5-(2-carboxyvinyl)-2,4-dimethoxypyrimidine (0.300 g; 1.43 mmol) in dry DMF (5 ml) was added K2CO3 (0.45 g: 5.25 mmol). After stirring at ambient temperature for 15 min. a solution of N.-bromosuccinimide (0.258 g; 1.45 mmol) in dry DMF (4 ml) was added dropwise over 10 min. The suspension was immediately filtered, the solid washed with DMF and the filtrate evaporated in high vacuum. The solid residue was purified by column chromatography by preloading on SiO2 and eluting with EtOAc-hexane (7:3, v/v). Product fractions were pooled and evaporated to give fine white crystals, yield 0.561 g (45%). FAB mass spectrum: m/z245 and 247 (M+H)+. Analysis, found: C,39.9; H, 3.6; N, 11.5% C8H9BrN2O2 requires C, 40.20; H, 3.70; N. 11.43%.

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