Dimethylformamide → (S)-6-(2-Hydroxy-2-methyl-propyl)-3-{(S)-1-[4-(1-methyl-2-oxo-1,2-dihydro-pyridin-4-ylethynyl)-phenyl]ethyl}-6-phenyl-[1,3]oxazinan-2-one

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CuI (68 mg), Pd(PPh3)2Cl2 (125 mg), and NEt3 (0.82 mL) were added successively to a flask charged with a stir bar, 4-bromo-1-methyl-1H-pyridin-2-one (0.38 g), 3-[(S)-1-(4-ethynyl-phenyl)-ethyl]-(S)-6-(2-hydroxy-2-methyl-propyl)-6-phenyl-[1,3]oxazinan-2-one (0.61 g), and N,N-dimethylformamide (3 mL) and kept at room temperature under argon atmosphere. The resulting mixture was heated to 100° C. and stirred at this temperature for 4 h. After cooling the mixture to ambient temperature, water was added and the resulting mixture was extracted with ethyl acetate. The combined organic extracts were washed with water and brine and dried (MgSO4). The solvent was evaporated and the residue was chromatographed on silica gel twice (first chromatography: ethyl acetate/methanol 1:0->4:1; second chromatography: dichloromethane/methanol 19:1->9:1) to afford the title compound as an oil which crystallized from ethyl acetate. Yield: 0.27 g (34% of theory); LC-MS (Method 1): tR=3.41 min; Mass spectrum (ESI+): m/z=485 [M+H]+.

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