Phosphorus oxychloride → Methyl (4-chloro-6-methyl-2-methylmercapto-5-pyrimidinyl)-acetate
Reaction equation
O[C:2]1[C:7]([CH2:8][C:9]([O:11][CH3:12])=[O:10])=[C:6]([CH3:13])[N:5]=[C:4]([S:14][CH3:15])[N:3]=1.O=P(Cl)(Cl)[Cl:18]>C(N(CC)C1C=CC=CC=1)C>[Cl:18][C:2]1[C:7]([CH2:8][C:9]([O:11][CH3:12])=[O:10])=[C:6]([CH3:13])[N:5]=[C:4]([S:14][CH3:15])[N:3]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
Methyl (4-hydroxy-6-methyl-2-methylmercapto-5-pyrimidinyl)-acetate (4.0 g, 17 mmol) is heated in a mixture of phosphoroxychloride (40 ml) and N,N-diethylaniline (5.5 ml) for 2 hours at 100° C. The excess phosphoroxychloride was removed by evaporation under vacuum and the residue poured into ice-water. Extraction with ethyl acetate, drying and filtration over silicagel gives methyl (4-chloro-6-methyl-2-methylmercapto-5-pyrimidinyl)-acetate as a crystalline solid (3.1 g, 72%), having a m.p. of 88° C.