[Br:1][C:2]1[S:3][C:4]([C:7]([C:9](=[CH:12]N(C)C)[C:10]#[N:11])=O)=[CH:5][CH:6]=1.Cl.[O:17]=[C:18]1[NH:22][CH2:21][CH2:20][N:19]1[CH2:23][CH2:24][NH:25][C:26]([NH2:28])=[NH:27].C(=O)([O-])[O-].[Cs+].[Cs+]>CN1CCCC1=O.CO>[Br:1][C:2]1[S:3][C:4]([C:7]2[C:9]([C:10]#[N:11])=[CH:12][N:28]=[C:26]([NH:25][CH2:24][CH2:23][N:19]3[CH2:20][CH2:21][NH:22][C:18]3=[O:17])[N:27]=2)=[CH:5][CH:6]=12-(2-Bromothiophene-5-carbonyl)-3-(dimethylamino)acrylonitrile) (3 g, 10 mmol) in N-methyl pyrrolidone (15 mL) was treated with 1-(2-(2-oxoimidazolidin-1-yl)ethyl)guanidine hydrochloride (1 M solution in N-methyl pyrrolidone, 15 mL, 15 mmol) and cesium carbonate (3.4 g, 10 mmol). The mixture was heated at 100° C. overnight. The reaction was then allowed to cool to room temperature and poured onto crushed ice. The resulting solid that formed was suspended in hot methanol to give a yellow solid (2.3 g). The filtrate was concentrated and purified by flash chromatography using a gradient of 3 to 10% methanol in dichloromethane to obtain an additional 0.9 g of the desired product. Total yield=3.2 g. MS (M+H)+ 394.
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