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Wanner, Klaus Th. and Praschak, Ilona and Nagel, Ulrich (1990): Asymmetric Electrophilic alpha-Amidoalkylation, VII1): Generation, Crystal Structure, and Trapping Reactions of a Chiral 6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline Derived N-Acyliminium Ion. In: Archiv der Pharmazie, Vol. 323, No. 6: pp. 335-350

Wanner, Klaus Th. and Praschak, Ilona (1989): Asymmetric Electrophilic alpha-Amidoalkylation 6. Syntheses of Tetrahydroisoquinolines of High Enantiomeric Purity. In: Heterocycles, Vol. 29, No. 1: pp. 29-33