[NH2:1][C:2]1[N:7]=[CH:6][C:5]([CH:8]=[O:9])=[CH:4][N:3]=1.[CH3:10][O:11][C:12]1[N:17]=[CH:16][C:15]([CH:18]=O)=[CH:14][CH:13]=1.FC(F)(F)C(O)=O.C([SiH](CC)CC)C>C(#N)C>[CH3:10][O:11][C:12]1[N:17]=[CH:16][C:15]([CH2:18][NH:1][C:2]2[N:7]=[CH:6][C:5]([CH:8]=[O:9])=[CH:4][N:3]=2)=[CH:14][CH:13]=1
In a round bottom flask, 2-amino-pyrimidine-5-carbaldehyde (70, 0.750 g, 6.09 mmol), 6-methoxy-pyridine-3-carbaldehyde (64, 1.67 g, 12.2 mmol), trifluoroacetic acid (2.5 mL, 32.0 mmol), and triethylsilane (5.00 mL, 31.3 mmol) were combined with 10 mL of acetonitrile. The reaction was stirred at room temperature overnight, then concentrated under vacuum and combined with aqueous potassium carbonate and extracted with ethyl acetate. The organic layer was dried over sodium sulfate, filtered and the filtrate concentrated under vacuum. The resulting material was purified by silica gel flash column chromatography, eluting with 15-100% ethyl acetate in hexane. Appropriate fractions were combined and concentrated under vacuum to provide the desired compound.
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