Hydrochloric Acid → 2-(2-Tetrahydropyranyl)oxy-2-(2-mesylamino-1,3-thiazol-4-yl)acetic acid

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Reaction Steps

To ethyl 2-(2-tetrahydropyranyl)oxy-2-(2-mesylamino-1,3-thiazol-4-yl)acetate, which can be represented as ethyl 2-(2-tetrahydropyranyl)oxy-2-(2-mesylimino-2,3-dihydro-1,3-thiazol-4-yl)acetate, (0.85 g.) was added 1H sodium hydroxide aqueous solution prepared by sodium hydroxide (0.28 g.) and water (7 ml.), and then the mixture was stirred for 1 hour at room temperature. After the reaction, to the reaction mixture was added ethyl acetate. The mixture was adjusted to pH 1 to 2 with 2N hydrochloric acid, and the aqueous layer was separated. The aqueous layer was subjected to saltingout and then extracted with ethyl acetate. The extract was washed with a saturated aqueous solution of sodium chloride, dried over magnesium sulfate and then the solvent was distilled off to give a foamy substance of 2-(2-tetrahydropyranyl)oxy-2-(2-mesylamino-1,3-thiazol-4-yl)acetic acid, which can be represented as 2-(2-tetrahydropyranyl)oxy-2-(2-mesylimino-2,3-dihydro-1,3-thiazol-4-yl)acetic acid, (0.52 g.).

Provenance & Evidence