| 摘要 |
The invention relates to a process for the production of a compound of the formula <IMAGE> (I) in which R denotes a hydrogen atom or an alkyl, aralkyl or aryl group and comprises deblocking a compound of the general formula <IMAGE> +TR <IMAGE> in which R has the meaning indicated above, by treatment with a strong mineral acid and isolating the intermediate product in the form of a salt thereof and then hydrogenating said salt with a suitable hydrogen donor, or, in a one-pot process, first deblocking the starting material by treatment with a strong mineral acid and, after controlled addition of a base, hydrogenating directly.
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