Sodium Hydroxide → 2(S)-Ethoxy-3-[4-(2-methylaminothiazol-5-yl)phenyl]propanoic acid

Beteiligte Stoffe

Reaktionsschritte

0.6 g (1.6 mmol) of methyl 3-{4-[2-(acetylmethylamino)thiazol-5-yl]phenyl}-2(S)-ethoxypropanoate in 25 ml of methanol and 2.4 ml (2.4 mmol) of aqueous 1M sodium hydroxide solution are heated at 60° C. for 18 hours. The reaction medium is cooled, diluted with water, acidified to pH 4-5 and then extracted with ethyl acetate and n-butanol. The organic phase is washed with saturated sodium chloride solution, dried over magnesium sulfate, filtered and evaporated. The residue obtained is used in step h without purification.

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