Dimethylformamide → 5-(4-chloro-3-(1-(pyridin-2-yl)cyclopropyl carbamoyl)phenyl)-2-(4-fluorophenyl)-N-methylbenzofuran-3-carboxamide

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Reaction Steps

To a 250 mL round-bottomed flask was added 2-chloro-5-(2-(4-fluorophenyl)-3-(methylcarbamoyl)benzofuran-5-yl)benzoic acid (0.299 g, 0.705 mmol), 1-(pyridin-2-yl)cyclopropanamine (0.142 g, 1.058 mmol), DMF (8.50 mL), N-ethyl-N,N-diisopropylpropan-2-amine (0.493 mL, 2.82 mmol), and HATU (2-(3H-[1,2,3]triazolo[4,5-b]pyridin-3-yl)-1,1,3,3-tetramethylisouronium hexafluorophosphate(V), 1.073 g, 2.82 mmol). The flask was sealed, placed under N2 and stirred overnight at room temperature. The reaction mixture was diluted with 50 mL of ethyl acetate, washed with 5 mL of 1M HCl, extracted, dried over magnesium sulfate, filtered and evaporated to a red oil. The crude reaction mixture was then evacuated to near dryness, taken up in 8 mL of 1:1 methanol and DMF and purified using a Shimadzu preparative HPLC employing methanol/water/trifluoroacetic acid where solvent A was 10% methanol/90% water/0.1% trifluoroacetic acid and solvent B was 10% water/90% methanol/0.1% trifluoroacetic acid with a Phenomenex-Luna 10 μm C18 30×100 mm column at a gradient of 50-100% B and a flow rate of 40 mL/min. over 8 minutes with a 7 minute hold. Solvent was evaporated giving 261.3 mgs (66.4% yield) of 5-(4-chloro-3-(1-(pyridin-2-yl)cyclopropyl carbamoyl)phenyl)-2-(4-fluorophenyl)-N-methylbenzofuran-3-carboxamide as a light yellow solid. The LC/MS data was obtained on a Shimadzu analytical LC/Micromass Platform LC (ESI+) at 220 nm using the following set of conditions: Waters Sunfire 5 μm C18, 4.6×50 mm column, with a gradient of 0-100% B (B=90% HPLC grade acetonitrile/0.1% trifluoroacetic acid/10% HPLC grade water), (A=90% HPLC grade water/0.1% trifluoroacetic acid/10% HPLC grade acetonitrile), in 3 minutes with a 1 minute hold at a rate of 4 mL/minute. HPLC purity was determined using a Shimadzu analytical LC at 254 nm and 256 nm with a Waters Sunfire C18 3.5 μm 4.6×150 mm column employing water/acetonitrile/0.1% trifluoroacetic acid with a gradient of 20-100% B (B=95% HPLC grade acetonitrile/0.1% trifluoroacetic acid/5% HPLC grade water), (A=95% HPLC grade water/0.1% trifluoroacetic acid/5% HPLC grade acetonitrile), in 10 minutes with a 10 minute hold at a rate of 1 mL/minute. The HPLC purity was then confirmed with an orthogonal solvent system and column using a Shimadzu analytical LC with a Phenomenex Gemini C18 3.0 μm 4.6×150 mm column employing water/methanol/10 mM ammonium bicarbonate with a gradient of 20-100% B (B=95% HPLC grade methanol/10 mM ammonium bicarbonate/5% HPLC grade water), (A=95% HPLC grade water/10 mM ammonium bicarbonate/5% HPLC grade methanol), in 10 minutes with a 10 minute hold at a rate of 1 mL/minute. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.33-1.40 (m, 2H), 1.56-1.64 (m, 2H), 2.83-2.91 (m, 3H), 7.27 (dd, J=6.78, 5.27 Hz, 1H), 7.35-7.45 (m, 2H), 7.63 (d, J=8.28 Hz, 1H), 7.69-7.96 (m, 7H), 7.97-8.06 (m, 2H), 8.50 (d, J=4.52 Hz, 2H), 9.34 (s, 1H). LCMS m/z 540.39 (M+H), Rt=1.643 min., 94.2% purity. HPLC (Sunfire C18) Rt=6.388 min, 94% purity and (Gemini C18) Rt=11.238 min., 99.6% purity.

Provenance & Evidence