Diisopropylethylamine → 4-(4-bromo-1-ethyl-1H-pyrazol-5-yl)-N-((1S)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-1-{[2-(trifluoromethyl)phenyl]methyl}ethyl)-2-thiophenecarboxamide

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To a solution of 4-(4-bromo-1-ethyl-1H-pyrazol-5-yl)-2-thiophenecarboxylic acid 156 mg, 0.52 mmol), 2-{(2S)-2-amino-3-[2-(trifluoromethyl)phenyl]propyl}-1H-isoindole-1,3(2H)-dione (0.18 g, 0.52 mmol) and DIPEA (0.5 mL, 2.86 mmol) in DCM (5 mL) at 25° C. was added PyBrOP (0.29 g, 0.62 mmol) in one portion. After 2 h, the solution was concentrated and purified via column chromatography (silica, 20-60% EtOAc/hexane) affording the title compound (0.281 g, 86%). LC-MS (ES) m/z=632 (M+H)+.

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