Dimethylformamide → 4,6-Dichloro-2-(methylsulfanyl)pyrimidine-5-carbaldehyde

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To the solution of phosphorus oxychloride (65 mL, 0.70 mol) in trichloroethylene (46.5 mL) was added DMF (25 mL, 0.32 mol) slowly to keep the temperature between 5° C. to 10° C. The solution was then warmed up to room temperature before 6-hydroxy-2-(methylthio)-4(1H)-pyrimidinone (25 g, 0.16 mol) was added in portions. The resultant reaction mixture was heated at 80° C. overnight followed by concentration under vacuum. The resulting slurry like residue was poured into ice, stirred for 2 hours then filtered to afford the crude product. The crude product was further purified by recrystalization with hexane to afford 4,6-dichloro-2-(methylthio)-5-pyrimidinecarbaldehyde (21.3 g, 61%). 1H-NMR (CDCl3) δ 2.66 (s, 3H), 10.4 (s, 1H).

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