A process for preparing tropenol (I) or an acid addition salt thereof, the process comprising: (a) reducing a scopine ester of formula (II) ?wherein R is C1-C4-alkyl or C1-C4-alkylene-phenyl, each optionally substituted by hydroxy or C1-C4-alkoxy, ?or an acid addition salt or hydrate thereof, using zinc in a suitable solvent in the presence of an activating metal salt; and (b) saponifying the product of (a) using a suitable base to obtain the tropenol of formula (I) or the acid addition salt thereof.
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(2008/06/13)
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