[H-].[Na+].[C:3]1([C:9]2[N:14]=[C:13]3[N:15]=[C:16]([NH2:19])[CH:17]=[CH:18][C:12]3=[N:11][CH:10]=2)[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[CH2:20]([N:23]=[C:24]=[S:25])[CH:21]=[CH2:22]>CN(C)C=O>[CH2:20]([NH:23][C:24]([NH:19][C:16]1[CH:17]=[CH:18][C:12]2[C:13]([N:15]=1)=[N:14][C:9]([C:3]1[CH:4]=[CH:5][CH:6]=[CH:7][CH:8]=1)=[CH:10][N:11]=2)=[S:25])[CH:21]=[CH2:22]0.246 g of sodium hydride (6.14 mmol) is introduced into 5 ml of anhydrous dimethylformamide under nitrogen as protective gas. The mixture is cooled to 0° C. in an ice bath. 1.05 g of 3-phenylpyrido[2,3-b]pyrazin-6-ylamine (4.72 mmol) are dissolved in 5 ml of anhydrous dimethylformamide and added dropwise. The cooling bath is removed, and the mixture is left to stir at RT for 30 minutes. The mixture is then cooled to 0° C. again in the ice bath, and 0.469 g of allyl isothiocyanate (4.72 mmol), dissolved in 4 ml of anhydrous dimethylformamide, is added dropwise. After the addition is complete, the cooling bath is removed, and the mixture is then left to stir at room temperature for 1.5 hours. For working up, the mixture is poured into about 250 ml of distilled water, and the precipitated orange solid is filtered off with suction. Purification by column chromatography several times (mobile phases dichloromethane/methanol mixtures) and subsequent purification by preparative HPLC afford a yellow solid.
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