1,8-Diazabicyclo(5.4.0)undec-7-ene → HCID 67292857, compound

Participants

Reaction Conditions

Reaction Steps

To a small screw cap vial was added 2-(4-fluorophenyl)-5-(2-hydroxy-5-(1-phenylcyclopropyl carbamoyl)phenyl)-N-methylbenzofuran-3-carboxamide (19.5 mg, 0.037 mmol) in DMF (1.3 mL), (2-bromoethoxy)(tert-butyl)dimethylsilane (0.024 mL, 0.112 mmol), and DBU (1,8-diazabicyclo[5.4.0]undec-7-ene, 0.023 mL, 0.150 mmol). The vial was capped and shaken at 80° C. for 18 hours. The DMF was removed under a stream of nitrogen to give 5-(2-(2-(tert-butyldimethylsilyloxy)ethoxy)-5-(1-phenylcyclopropyl carbamoyl)phenyl)-2-(4-fluorophenyl)-N-methylbenzofuran-3-carboxamide as a tan oil. To the mixture was then added 1.3 mL of tetrahydrofuran along with 2 eq. of 1 M HCl (0.075 mL, 0.075 mmol). The solution was stirred for 1 hour at room temperature. The reaction mixture was transferred to a separatory funnel, diluted with ethyl acetate, washed sequentially with sodium bicarbonate, brine and dried over magnesium sulfate. The product mixture was filtered and the solvent was evaporated. The crude product was taken up in 1.8 mL of acetonitrile and 200 μL of DMF and purified using a Shimadzu preparative HPLC employing acetonitrile/water/trifluoroacetic acid where solvent A was 10% acetonitrile/90% water/0.1% trifluoroacetic acid and solvent B was 10% water/90% acetonitrile/0.1% trifluoroacetic acid with a Sunfire C18 19×150 mm column at a gradient of 20-100% B and a flow rate of 20 mL/min. over 20 minutes with a 5 minute hold. 15.2 mgs of 2-(4-fluorophenyl)-5-(2-(2-hydroxyethoxy)-5-(1-phenylcyclopropyl carbamoyl)phenyl)-N-methylbenzofuran-3-carboxamide (70% yield, 2 steps) was obtained after solvent evaporation. The LC/MS data was obtained on a Shimadzu analytical LC/MICROMASS® Platform LC (ESI+) at 220 nm using the following set of conditions: Sunfire 5 μm C18, 4.6×50 mm column, with a gradient of 0-100% B (B=90% HPLC grade methanol/0.1% trifluoroacetic acid/10% HPLC grade water), (A=90% HPLC grade water/0.1% trifluoroacetic acid/10% HPLC grade methanol), in 4 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 10-100% 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 Gemini C18 3.0 μm 4.6×150 mm column employing water/methanol/10 mM ammonium bicarbonate with a gradient of 10-100% 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, THF-d8) δ ppm 1.20-1.27 (m, 2H), 1.28-1.36 (m, 2H), 2.87-2.96 (m, 3H), 3.75-3.83 (m, 3H), 4.10 (t, J=4.89 Hz, 2H), 7.04-7.13 (m, 2H), 7.16-7.25 (m, 4H), 7.29-7.35 (m, 2H), 7.43 (d, J=4.27 Hz, 1H), 7.51-7.59 (m, 2H), 7.87 (dd, J=8.53, 2.26 Hz, 1H), 7.94 (d, J=2.26 Hz, 1H), 8.02 (s, 1H), 8.11-8.18 (m, 2H), 8.25 (s, 1H). LCMS Rt=2.671 min., m/z 565.3 (M+H). HPLC Rt=9.454 min. (Sunfire C18), 95.0% purity and 11.611 min. (Gemini C18), 99.7% purity.

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