反应详情

To a 25 mL flask was added 4-(2-amino-2-oxoethoxy)-5-(2-(4-fluorophenyl)-3-(methyl carbamoyl)benzofuran-5-yl)-2-methoxybenzoic acid (49.2 mg, 0.1 mmol), DMF (2 mL), N-ethyl-N-diisopropylpropan-2-amine (0.069 mL, 0.396 mmol), 2-methylpropan-2-amine (18 mg, 26 μL, 0.246 mmol) and finally HATU (2-(3H-[1,2,3]triazolo[4,5-b]pyridin-3-yl)-1,1,3,3-tetramethyl isouronium hexafluorophosphate(V), 151 mg, 0.396 mmol). The flask was sealed with a septum, placed under N2 and stirred at room temperature overnight. The crude product was 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 Waters Sunfire 5 μm C18 19×150 mm column at a gradient of 20-100% B and a flow rate of 25 mL/min. over 22 minutes with a 8 minute hold. The solvent was removed giving 28.3 mgs (52% yield) of 5-(2-(2-amino-2-oxoethoxy)-4-methoxy-5-(1-(pyridin-2-yl)cyclopropylcarbamoyl)phenyl)-2-(4-fluorophenyl)-N-methylbenzofuran-3-carboxamide as a yellow powder. The LC/MS data was obtained on a Shimadzu analytical LC/Micromass Platform LC (ESI+) at 220 nm using the following set of conditions: Phenomenex Luna 3 μm C18, 2×50 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 4 minutes with a 1 minute hold at a rate of 0.8 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 Phenomenex 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 1.43 (s, 9 H), 2.91 (d, J=4.77 Hz, 3 H), 4.03 (s, 3 H), 4.51 (s, 2 H), 6.43 (br. s., 1 H), 6.71-6.77 (m, 1 H), 6.78 (s, 1 H), 7.21 (t, J=8.78 Hz, 2 H), 7.46-7.52 (m, 1 H), 7.52-7.54 (m, 1 H), 7.54-7.59 (m, 1 H), 7.67 (s, 1 H), 7.92 (s, 1 H), 8.10-8.16 (m, 2 H), 8.19 (s, 1 H). LCMS rt=2.976 min., m/z 548.2 (M+H), 98.3% purity. HPLC rt=9.088 min. (Sunfire C18), 99.0% purity and 11.588 min. (Gemini C18), 99.4% purity.

1. customThe flask was sealed with a septum
2. customThe crude product was purified
3. waita flow rate of 25 mL/min. over 22 minutes with a 8 minute hold
4. customThe solvent was removed