Water → 3-{2,5-Dichloro-4-[3-(4-cyclopropyl-3,4-dihydro-2H-quinoxaline-1-carbonyl)-pyridin-4-yloxy]-benzoylamino}-propionic acid

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Reaction Steps

To a solution of 0.85 g (1.46 mmol) 3-{2,5-dichloro-4-[3-(4-cyclopropyl-3,4-dihydro-2H-quinoxaline-1-carbonyl)-pyridin-4-yloxy]-benzoylamino}-propionic acid ethyl ester (Example 33) in 7.5 mL dioxane were added 7.5 mL water and 0.076 g (1.81 mmol) lithium hydroxide monohydrate. The resulting suspension was stirred for 2.25 hours at room temperature and dioxane was removed by evaporation. The pH of the solution was adjusted to 2.5 by adding 1.9 mL 1M aqueous hydrochloric acid and the suspension was stirred for 2 hours at room temperature. The suspension was filtered, the filter cake washed with water and dried under high vacuum to give 0.70 g (86%) of the desired compound as an off-white solid. MS (ESI): m/z=555.12 [M+H]+.

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