[Cl:1][C:2]1[N:7]=[C:6](Cl)[C:5]([S:9][CH3:10])=[CH:4][N:3]=1.C([O-])([O-])=O.[Na+].[Na+].[NH:17]1[CH2:22][CH2:21][O:20][CH2:19][CH2:18]1.CC(=O)OCC>CC(C)=O>[Cl:1][C:2]1[N:7]=[C:6]([N:17]2[CH2:22][CH2:21][O:20][CH2:19][CH2:18]2)[C:5]([S:9][CH3:10])=[CH:4][N:3]=1A solution of the 2,4-dichloro-5-(methylthio)pyrimidine (1.16 g, 6 mmole) in acetone (10 ml) at 0° C. containing Na2CO3 (1.1 eq, 6.6 mmole, 0.7 g) was treated dropwise with a solution of morpholine (1.0 eq, 6.6 mmole, 0.6 ml) in acetone (2 ml) and stirred for 1 hr at 0° C. TLC (EA:Hex=1:2, Rf=0.6) showed completion of the reaction to give two products. The acetone was removed in vacuo, the residue was partitioned between water and EA, and the organic layer was dried (MgSO4) and evaporated in vacuo. Column chromatography (EA/Hex=1/6) gave the product (700 mg, 47%).
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