[OH:1][N:2]=[C:3]([C:5]1[CH:9]=[CH:8][S:7][C:6]=1[NH:10][C:11](=[O:21])[CH2:12][C:13]1[CH:18]=[CH:17][C:16]([O:19][CH3:20])=[CH:15][CH:14]=1)[NH2:4].[CH3:22][CH2:23]N(C(C)C)C(C)C.C(Cl)(=O)C>C(#N)C.C(=O)(O)[O-].[Na+]>[CH3:20][O:19][C:16]1[CH:15]=[CH:14][C:13]([CH2:12][C:11]([NH:10][C:6]2[S:7][CH:8]=[CH:9][C:5]=2[C:3]2[N:4]=[C:22]([CH3:23])[O:1][N:2]=2)=[O:21])=[CH:18][CH:17]=1To a solution of N-(3-(N′-hydroxycarbamimidoyl)thiophen-2-yl)-2-(4-methoxyphenyl)-acetamide (104 mg, 0.341 mmol) in acetonitrile (2 mL) was added DIPEA (127 mg, 0.987 mmol) and acetyl chloride (48 μL, 0.681 mmol). The resulting solution was stirred at 60° C. for 18 h and was subsequently diluted with saturated aqueous sodium bicarbonate and extracted with ethyl acetate. The organic phases were combined, dried (Na2SO4), filtered, concentrated under vacuum and purified by preparative HPLC to give 2-(4-methoxyphenyl)-N-(3-(5-methyl-1,2,4-oxadiazol-3-yl)thiophen-2-yl)acetamide. Retention time (min)=6.733, method [7], MS(ESI) 330.1 (M+H); 1H NMR (300 MHz, CDCl3) δ 10.63 (s, 1H), 7.30-7.35 (m, 3H), 7.00 (d, J=9.2 Hz, 2H), 6.89 (d, J=6.2 Hz, 1H), 3.86 (s, 3H), 3.80 (s, 2H), 2.50 (s, 3H).
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