[NH2:1][C:2]1[CH:7]=[C:6]([NH:8][C:9](=[O:18])[C:10]2[C:15]([Cl:16])=[CH:14][CH:13]=[CH:12][C:11]=2[Cl:17])[CH:5]=[CH:4][N:3]=1.[S:19]1[CH:23]=[CH:22][CH:21]=[C:20]1[C:24](Cl)=[O:25].O>N1C=CC=CC=1>[Cl:16][C:15]1[CH:14]=[CH:13][CH:12]=[C:11]([Cl:17])[C:10]=1[C:9]([NH:8][C:6]1[CH:5]=[CH:4][N:3]=[C:2]([NH:1][C:24]([C:20]2[S:19][CH:23]=[CH:22][CH:21]=2)=[O:25])[CH:7]=1)=[O:18]N-(2-aminopyridin-4-yl)-2,6-dichlorobenzamide (240 mg, 0.86 mmol) was dissolved in pyridine (10 mL). The mixture was stirred at 0° C. for 20 min. and then thiophene-2-carbonyl chloride (113 mg, 0.77 mmol) was added dropwise. The mixture was warmed to 23° C. and stirred under nitrogen overnight. The next day, water (1 mL) was added and the mixture was stirred for 5 min. The reaction was concentrated under reduced pressure and the residue was purified by reverse-phase HPLC (Gemini, 200 mm×25 mm, gradient: CH3CN/0.05% NH3.H2O, 50-80, 10 min) to afford the desired product (72.6 mg, yield: 22%). 1HNMR: (DMSO-d6, 400 MHz): δ 11.38 (s, 1H), 10.92 (s, 1H), 8.47 (s, 1H), 8.33 (d, J=5.6 Hz, 1H), 8.26 (d, J=2.8 Hz, 1H), 7.90 (d, J=5.2 Hz, 1H), 7.62-7.51 (m, 4H), 7.22 (t, J=4.4 Hz, 1H). LCMS (ESI) (m/z): 414.3 [M+Na+].
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