[C:1]([C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][CH:13]=1)[N:10]([CH:14]1[CH2:19][CH2:18][O:17][CH2:16][CH2:15]1)[C:9](=[O:20])[N:8]([CH2:21][C:22]1[CH:27]=[CH:26][C:25]([O:28][CH3:29])=[C:24]([O:30][CH3:31])[CH:23]=1)[C:7]2=[O:32])(=[O:3])[CH3:2].[CH3:33][Mg]I>CCOCC>[CH3:31][O:30][C:24]1[CH:23]=[C:22]([CH:27]=[CH:26][C:25]=1[O:28][CH3:29])[CH2:21][N:8]1[C:7](=[O:32])[C:6]2[C:11](=[CH:12][CH:13]=[C:4]([C:1]([OH:3])([CH3:33])[CH3:2])[CH:5]=2)[N:10]([CH:14]2[CH2:15][CH2:16][O:17][CH2:18][CH2:19]2)[C:9]1=[O:20]0.1 g of 6-acetyl-3-(3,4-dimethoxybenzyl)-1-(tetrahydro-2H-pyran-4-yl)quinazoline-2,4(1H,3H)-dione is added to a solution of 0.143 g of methylmagnesium iodide in 1 ml of Et2O. This mixture is stirred for 30 minutes at 0° C. and then overnight at room temperature. The reaction mixture is evaporated under reduced pressure. The residue is chromatographed on silica gel, eluting with EtOAc to give 0.01 g of the expected product.
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