To a solution of 4-bromo-3-(4H-1,2,4-triazol-3-yl)thiophen-2-amine (50 mg, 0.2 mmol) and 2-(isoquinolin-4-yl)acetic acid (56 mg, 0.3 mmol) in methylene chloride (2 mL) were added Hunig's base (i.e., N,N-diisopropylethylamine) (71 uL, 0.4 mmol) and HBTU (133 mg, 0.35 mmol). The heterogeneous reaction mixture was homogenous after 3 h. The reaction was quenched with saturated aqueous ammonium chloride and the aqueous was extracted with methylene chloride. The organic phase was washed with brine and dried over sodium sulfate. The resulting solution was concentrated to provide a pale red solid, which was purified by column chromatography using 3.5% MeOH/CH2Cl2. LCMS: retention time 1.955 min using analytical method [7] with an M+Na of 414.0. 19.0 mg (15% yield): white solid. 1H-NMR (300 MHz, CDCl3) δ 9.34 (s, 1H), 8.66 (s, 1H), 8.07 (d, J=8.0 Hz, 1H), 8.01 (d, J=8.0 Hz, 1H), 7.75 (m, 1H), 7.65 (m, 2H), 6.88 (d, J=0.5 Hz, 1H), 4.30 (s, 2H). 13C-NMR (75 MHz, CDCl3) δ 168.3, 153.2, 144.8, 142.8, 135.0, 131.5, 128.7, 128.4, 127.8, 123.5, 122.9, 116.2, 104.7, 38.7.
