Cl.[CH3:2][C:3]1[S:4][CH:5]=[C:6]([C:8]2[C:9](=[O:15])[NH:10][C:11](=[O:14])[NH:12][CH:13]=2)[N:7]=1.C([O-])([O-])=O.[K+].[K+].Br[CH2:23][CH2:24][CH:25]([O:28][CH3:29])[O:26][CH3:27].Cl>CN(C)C=O.O>[CH3:27][O:26][CH:25]([O:28][CH3:29])[CH2:24][CH2:23][N:12]1[CH:13]=[C:8]([C:6]2[N:7]=[C:3]([CH3:2])[S:4][CH:5]=2)[C:9](=[O:15])[NH:10][C:11]1=[O:14]5-(2-methyl-1,3-thiazol-4-yl)-2,4(1H,3H)-pyrimidinedione hydrochloride (Prep20, 287 mg, 1.110 mmol) was dissolved in N,N-Dimethylformamide (DMF) (4 ml). K2CO3(460 mg, 3.33 mmol) were added and the reaction mixture stirred at room temperature for 1 h. 3-bromo-1,1-bis(methyloxy)propane (0.185 ml, 1.221 mmol) was added. The obtained mixture was then stirred at room temperature. After 4 days it was diluted with water, neutralized with HCl, and extracted by EtOAc. The organic phase was washed with water (3 times), brine, dried over Na2SO4, filtered and the solvent evaporated. The obtained crude was purified by preparative LC-MS. 58.5 mg of the title compound were isolated as a white solid.
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