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   <subfield code="a">Reaktionen von (−)-Ephedrin bzw. (+)-Norpseudoephedrin und Derivaten mit N,N-Dimethylacetamid-dimethylacetal und N,N,-Dimethylformamid-dimethylacetal</subfield>
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   <subfield code="a">Reactions of (−)-ephedrine, (+)-norpseudoephedrine and derivatives with N,N-dimethylacetamid-dimethylacetal and N,N-dimethylformamid-dimethylacetal</subfield>
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   <subfield code="a">Summary: The reactivity of (−)-ephedrine (2) and (+)-norpseudoephedrine (3) towards the amidacetals1 a/b has been studied. Both2 and3 were acetylated resp. formylated at first at the amino group. Nevertheless, derivatives of2 and3 possessing a trisubstituted amino group react with1 a in a [3.3] sigmatopic rearrangement toortho substituted dimethylcarbamoylmethyl derivatives. By subsequent reduction with lithiumaluminiumhydride the aromatic compounds8,13, and18 with two aminoethyl groups are easily available. In contrast to these results1 b did not furnish any rearrangement products.</subfield>
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