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4-Amino-3,5-cyclopiperidine compounds 4a, 4b and 11 with unsubstituted amino moieties in 1- and/or 4-position were prepared via tribenzyl derivative 10 by selective removal of the protecting groups. The preference of a cyclopiperidine boat conformation of diamines4a , 4b and 11 in solution was indicated by 1 H NMR spectroscopy. X-Ray structural analysis of carboxamide 4a established the...
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