[CH3:1][C:2]1[C:3](=[O:9])[NH:4][C:5](=[O:8])[NH:6][CH:7]=1.C([O-])([O-])=O.[K+].[K+].Br[CH2:17][CH2:18][CH2:19][CH:20]([Cl:22])[CH3:21].O>CN(C=O)C>[Cl:22][CH:20]([CH3:21])[CH2:19][CH2:18][CH2:17][N:6]1[CH:7]=[C:2]([CH3:1])[C:3](=[O:9])[NH:4][C:5]1=[O:8]A mixture of 5-methyl-2,4(1H,3H)-pyrimidinedione (thimine, 500 mg) and K2CO3 (548 g) in dry DMF (15 mL) was stirred for 1 hour at room temperature. 1-bromo-4-chloropentane (0.548 mL) was then added and the mixture was stirred at room temperature for 4 hours. Water was then added and the resulting mixture was extracted with dichloromethane. The aqueous phase was acidified to pH 7 with aqueous 2% HCl solution and extracted with DCM. The organic phases were dried and concentrated in vacuo. The crude product was purified by a silica SPE cartridge eluting with DCM/MeOH from 98/2 to 95/5 to give the title compound (100 mg).
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