Capping Methodology in Cyclodextrin Chemistry: Use of a Symmetrical Diketone Reagent for Regiospecific Installation of Unsymmetrical Imine-Enamine and Imidazole Caps
Methylated α‐ and β‐cyclodextrin skeletons were both equipped with an unsymmetrical N‐(2‐N‐alkylaminoacenaphthenyl)alkylimine rigid handle. The capping reaction, which consists of condensing a diaminocyclodextrin with highly symmetrical acenaphthenequinone, was found to be regiospecific when starting from cyclodextrin‐diamines without any symmetry element. All modified cyclooligosaccharides have intra‐annular