Sodium borohydride → Ethyl 2-hydroxy-2-(2-mesylamino-1,3-thiazol-4-yl)acetate

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반응 단계

To a mixture of ethyl 2-(2-mesylamino-1,3-thiazol-4-yl)glyoxylate, which can be represented as ethyl 2-(2-mesylimino-2,3-dihydro-1,3-thiazol-4-yl)glyoxylate, (3.60 g.) and ethanol (50 ml.) was added sodium borohydride (0.32 g.) under stirring and ice-cooling, and then the mixture was stirred for 40 minutes at room temperature. After the reaction, the reaction mixture was concentrated. The residue was poured into a mixture of ethyl acetate (100 ml.) and dilute hydrochloric acid, and the aqueous solution was separated. Thus obtained aqueous solution (pH 1 to 2) was subjected to salting-out and then extracted with ethyl acetate. The extract was washed with a saturated aqueous solution of sodium chloride and dried over magnesium sulfate. The extract was treated with activated charcoal and then the solvent was distilled off to give a solid of ethyl 2-hydroxy-2-(2-mesylamino-1,3-thiazol-4-yl)acetate, which can be represented as ethyl 2-hydroxy-2-(2-mesylimino-2,3-dihydro-1,3-thiazol-4-yl)acetate, (2.6 g.)

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