Hydrazine hydrate (1:1) → 2-{[4-(2-Aminoethyl)-1,3-thiazol-2-yl]thio}-2-methylpropionic acid tert-butyl ester

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Reaktionsschritte

2-Methyl-2-{[4-(2-phthalimidoethyl)-1,3-thiazol-2-yl]thio}propionic acid tert-butyl ester (136 g) synthesized in Example 6 was dissolved in ethanol (800 mL), hydrazine monohydrate (47.2 g) was added, and the mixture was refluxed for 4 hr. White precipitate was filtered off from the reaction mixture, and the filtrate was concentrated under reduced pressure. Water was added thereto, and the mixture was extracted with dichloroethane. The organic layer was washed with saturated brine and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure to give the title compound (77.6 g) as a brown oil.

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