[Cl:1][C:2]1[CH:7]=[C:6]([O:8]C)[N:5]=[C:4]([CH2:10][C:11]([N:13]2[C:21]3[C:16](=[CH:17][CH:18]=[CH:19][CH:20]=3)[C:15]([CH3:23])([CH3:22])[CH2:14]2)=[O:12])[N:3]=1.C(#N)C.[I-].[K+].C[Si](C)(C)Cl>O>[Cl:1][C:2]1[N:3]=[C:4]([CH2:10][C:11]([N:13]2[C:21]3[C:16](=[CH:17][CH:18]=[CH:19][CH:20]=3)[C:15]([CH3:22])([CH3:23])[CH2:14]2)=[O:12])[NH:5][C:6](=[O:8])[CH:7]=1106 mg of 2-(4-chloro-6-methoxypyrimidin-2-yl)-1-(3,3-dimethyl-2,3-dihydroindol-1-yl)ethanone and 4 ml of acetonitrile are placed in a reactor suitable for microwave irradiation and then 0.45 g of potassium iodide and 347 μl of trimethylchlorosilane are added. The orangey-colored heterogeneous solution is stirred and irradiated at 100° C. for 1 hour. The resulting product is taken up in 25 ml of water and stirred, extraction is carried out with 3 times approximately 25 ml of EtOAc, washing is carried out with 25 ml of saturated NaCl solution, drying is carried out over MgSO4, filtered through a VF filter and the resulting product is concentrated under vacuum. The compound obtained is chromatographed on silica gel, elution being carried out with methanol/dichloromethane (2.5/97.5). The fractions containing the expected compound are combined and evaporated under reduced pressure. 6-Chloro-2-[2-(3,3-dimethyl-2,3-dihydroindol-1-yl)-2-oxoethyl]-3H-pyrimidin-4-one is isolated and characterized: 0.20 g in the form of a yellow solid; yield 70% (LCMS ES+ retention time Tr (min)=1.19; [M+H]+: m/z 318).
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