反应详情

To a solution of 4-{2-[5-(2-pyrrolidin-1-ylethoxy)benzofuran-2-carbonylamino]-ethoxy}-benzoic acid methyl ester (169 mg, 0.37 mmol) in methanol (8 ml) and tetrahydrofuran (4 ml) was added hydroxylamine in water (2.9 ml of a 50 wt. % solution) and 4.0 M aqueous solution of sodium hydroxide (0.65 ml). After stirring for 18 h, the organics were removed and the aqueous solution was cooled in an ice/water bath and the pH was adjusted to ˜8 with 4.4 ml 1.0 M hydrochloric acid to give precipitates. The heterogeneous solution was warmed to room temperature and acetonitrile was added till the precipitates dissolved. The solution was chromatographed on C-18 reverse phase HPLC. Fractions with absorbance at 214 nm, were collected, frozen, and lyophilize to give the title compound (31 mg). 1H NMR (400 MHz, DMSO-d6) δ: 11.05 (s, 1H), 10.4 (s, 1H), 8.91 (s, 2H), 7.70 (d, 2H, J=7.4), 7.59 (dd, 1H, J=3.7, 9.1 Hz), 7.51 (d, 1H, J=3.7 Hz), 7.35 (s, 1H), 7.13 (d, 1H, J=9.0 Hz), 7.00 (d, 2H, J=7.4 Hz), 4.37 (m, 2H), 4.18 (m, 2H), 3.62 (m, 6H), 3.12 (m, 2H), 2.02 (m, 2H), 1.89 (m, 2H). EM (calc.): 453.2; MS (ESI) rate (M+1H)+: 454.1, (M−1H)−: 452.2.

1. customthe organics were removed
2. temperaturethe aqueous solution was cooled in an ice/water bath
3. customto give
4. customprecipitates
5. additionacetonitrile was added till the precipitates
6. dissolutiondissolved
7. customThe solution was chromatographed on C-18 reverse phase HPLC
8. customFractions with absorbance at 214 nm, were collected
9. temperaturefrozen