[N:1]1([C:6]2[C:7](=[O:13])[NH:8][C:9](=[O:12])[NH:10][CH:11]=2)[CH2:5][CH2:4][CH2:3][CH2:2]1.C([O-])([O-])=O.[K+].[K+].Br[CH2:21][CH2:22][CH2:23][Cl:24].O>CN(C=O)C>[Cl:24][CH2:23][CH2:22][CH2:21][N:10]1[CH:11]=[C:6]([N:1]2[CH2:2][CH2:3][CH2:4][CH2:5]2)[C:7](=[O:13])[NH:8][C:9]1=[O:12]A mixture of 5-(1-pyrrolidinyl)-2,4(1H,3H)-pyrimidinedione (507 mg, commercially available from Interchim Intermediates) and K2CO3 (386 mg) in dry DMF (10 mL) was stirred for 1 hour at room temperature. 1-Bromo-3-chloropropane (0.28 mL) was added and the mixture was stirred at room temperature for 20 hours. Water was added and the resulting mixture was extracted with ethyl acetate. The organic phases were washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude product was purified by a silica flash chromatography (eluting with A: dichloromethane, B: dichloromethane/methanol=9/1 at ratio A:B=6:4) to give the title compound as a colourless oil (150 mg).
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