Triethylamine → N-(1-bromoisoquinolin-3-yl)-1-(4-methoxyphenyl)cyclopropanecarboxamide

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To 1-(4-methoxyphenyl)cyclopropanecarboxylic acid (4.07 g, 21.17 mmol), thionyl chloride (4.64 mL, 63.52 mmol) and DMF (64 μL) were stirred at 50° C. for 3 hours, after which additional thionyl chloride (4 mL) and DMF (60 μL) were added and the mixture was stirred at 50° C. for 1 additional hour. The excess thionyl chloride was evaporated under reduced pressure. The resulting acid chloride was dissolved in anhydrous DCM (20 mL) and was slowly added to a cooled suspension of (0° C.) of 1-bromoisoquinolin-3-amine in DCM (50 mL) and Et3N (14.05 mL, 100.8 mmol). The reaction mixture was stirred at room temperature for 18 hours. The resulting mixture was diluted with DCM and washed with water (1×30 mL), 1 N NaOH (2×30 mL), 1 N HCl (1×30 mL), saturated aqueous NaHCO3 (1×30 mL) and brine (1×30 mL). The organic layer was dried over anhydrous Na2SO4 and evaporated under reduced pressure. The crude product was purified by column chromatography on silica gel (0-50% ethyl acetate in hexane) to yield N-(1-bromoisoquinolin-3-yl)-1-(4-methoxyphenyl)cyclopropanecarboxamide (6.0 g, 75%) as a yellow solid. ESI-MS m/z calc. 396.05. found 397.3 (M+1)+. Retention time 2.24 minutes. 1H NMR (400.0 MHz, CDCl3) d 8.55 (s, 1H), 8.15 (d, J=8.5 Hz, 1H), 7.89 (s, 1H), 7.78 (d, J=8.2 Hz, 1H), 7.69-7.65 (m, 1H), 7.56-7.52 (m, 1H), 7.46-7.42 (m, 2H), 7.01-6.98 (m, 2H), 3.90 (s, 3H), 1.75 (dd, J=3.7, 6.8 Hz, 2H) and 1.21 (dd, J=3.7, 6.9 Hz, 2H) ppm.

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