Hydrochloric Acid → tert-Butyl (2S)-2-amino-3-(4-(3-ethoxycarbonylpropyloxy)phenyl)propionate

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Reaction Steps

100 g (0.206 mol) of tert-butyl (2S)-2-benzyloxycarbonylamino-3-(4-(3-ethoxy-carbonylpropyloxy)phenyl)propionate (1.1) from Example 1 were dissolved in 1 liter of methanol, the solution was treated with methanolic hydrogen chloride solution and with 10 g of 20% palladium hydroxide/carbon and hydrogen was passed in for 6 hours. Then the catalyst was filtered off, the solution was evaporated and the residue was treated with tert-butylether. The precipitate formed was filtered off. 72 g (90%) of an amorphous powder were obtained.

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