反应详情

To a solution of 38 mg (0.067 mmol) {2,5-dichloro-4-[5-(4-cyclopropyl-3,4-dihydro-2H-quinoxaline-1-carbonyl)-2-methyl-pyridin-4-yloxy]-benzoylamino}-acetic acid methyl ester (Example 69) in 2 mL dioxane was added 2 mL water and 4 mg (0.083 mmol) lithium hydroxide monohydrate. The reaction mixture was stirred at room temperature for 4 hours and then poured on 20 mL 1N aqueous hydrochloric acid and 20 mL ethyl acetate. The layers were separated and the aqueous layer was extracted a second time with 20 mL ethyl acetate. The combined organic layers were washed with 30 mL brine, dried over magnesium sulfate, filtered and concentrated under vacuum to yield 10 mg (27%) of the desired compound as a light yellow solid. MS (ESI): m/z=555.119 [M+H]+.

1. customThe layers were separated
2. extractionthe aqueous layer was extracted a second time with 20 mL ethyl acetate
3. washThe combined organic layers were washed with 30 mL brine
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated under vacuum