Diisopropylethylamine → 8-Trifluoromethoxy-2-oxo-2H-chromene-3-carboxylic acid (2',4'-dimethoxy-biphenyl-3-yl)-amide

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Reaction Steps

DIEA (0.013 mL, 0.072 mmol) was added to 8-trifluoromethoxy-3-carboxy-coumarin (0.018 g, 0.065 mmol) and HATU (0.027 g, 0.072 mmol) in 0.36 mL of DMF with constant stirring at room temperature until a clear solution resulted. Subsequently, 2′,4′-dimethoxy-biphenyl-3-ylamine (0.015 g, 0.065 mmol) was added and allowed to react overnight. DMF was removed under vacuum and the reaction was resuspended in DMSO. The crude product was purified on a Parallex Flex parallel preparative reverse phase HPLC instrument (Biotage) using a solvent gradient of 10-95% ACN/H2O with 0.05% TFA at a flow rate of 20 mL/min. UV absorbance was monitored at 254 nm and the fractions corresponding to the product peak were collected and the solvent removed under vacuum to give 0.022 g of product in 70% yield: LCMS (ESI) m/z 486 (MH+).

Provenance & Evidence