反应详情

To a 50 mL round-bottomed flask was added methyl 4-(2-amino-2-oxoethoxy)-5-(2-(4-fluorophenyl)-3-(methyl carbamoyl)benzofuran-5-yl)-2-methoxybenzoate (171.6 mg, 0.295 mmol) in a 1:1 mixture of methanol (7 mL) and THF (7 mL). To this solution was then added 4 eq. of 1M aqueous sodium hydroxide (1.2 mL, 1.2 mmol). The reaction mixture was stirred overnight at room temperature. Solvent was removed and the crude product was diluted with 50 mL of 1:1 DCM/ethyl acetate, washed sequentially with 10 mL of 1M HCl then brine. The product solution was dried over sodium sulfate, filtered and evaporated to dryness. The aqueous layers were combined, cooled in an ice bath and the product that formed on the sides of the flask were filtered and dried under vacuum. The solids were combined, taken up in 10 mL of 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 40-100% B and a flow rate of 40 mL/min. over 12 minutes with a 10 minute hold. Solvent was removed giving 87 mgs (60% yield) of 4-(2-amino-2-oxoethoxy)-5-(2-(4-fluorophenyl)-3-(methylcarbamoyl)benzofuran-5-yl)-2-methoxybenzoic acid as a white 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: Waters Sunfire 5 μm C18, 4.6×30 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 2 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 Waters XBridge phenyl C18 3.5 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, DMF-d7) δ ppm 2.97 (d, J=4.52 Hz, 3H), 4.02 (s, 3H), 4.79 (s, 2H), 6.97 (s, 1H), 7.31 (br. s., 1H), 7.38-7.46 (m, 2H), 7.51 (br. s., 1H), 7.67-7.77 (m, 2H), 7.92 (s, 1H), 7.95 (s, 1H), 8.09-8.16 (m, 2H), 8.35 (d, 1H). LCMS m/z 493.00 (M+H), Rt=1.618 min. HPLC (Sunfire C18) Rt=7.108 min, 100% purity and (XBridge phenyl C18) Rt=6.383 min., 99.3% purity.

1. customSolvent was removed
2. additionthe crude product was diluted with 50 mL of 1:1 DCM/ethyl acetate
3. washwashed sequentially with 10 mL of 1M HCl
4. dry with materialThe product solution was dried over sodium sulfate
5. filtrationfiltered
6. customevaporated to dryness
7. temperaturecooled in an ice bath
8. customthe product that formed on the sides of the flask
9. filtrationwere filtered
10. customdried under vacuum
11. custompurified
12. waita flow rate of 40 mL/min. over 12 minutes with a 10 minute hold
13. customSolvent was removed