[NH2:1][C:2]1[CH:11]=[C:10]([C:12]([O:14][CH3:15])=[O:13])[CH:9]=[CH:8][C:3]=1[C:4]([O:6]C)=O.[CH3:16][CH:17]([CH3:21])[CH2:18][C:19]#[N:20].Cl.O>O1CCOCC1>[CH2:18]([C:19]1[NH:20][C:4](=[O:6])[C:3]2[C:2](=[CH:11][C:10]([C:12]([O:14][CH3:15])=[O:13])=[CH:9][CH:8]=2)[N:1]=1)[CH:17]([CH3:21])[CH3:16]A mixture of dimethyl 2-aminoterephthalate (3.0 g, 14.4 mmol), 3-methylbutanenitrile (1.2 g, 14.4 mmol), and saturated HCl solution in dioxane (20 mL) in sealed tube was stirred at 100° C. overnight. After it was cooled to room temperature, the reaction mixture was poured into water (50 mL) and extracted with ethyl acetate (3×20 mL). The combined organic layer was concentrated and the residue was purified by silica gel chromatography give the desired product. MS (ESI): 260 (MH+).
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