Synthesis of a bicyclic oxo-γ-lactam from a simple caprolactam derivative

Reaction of caprolactams with an axial ester substituent with base gives the 6-azabicyclo-[3.2.1]octane ring system via Dieckmann cyclization.

Synthesis of macrocyclic receptors with intrinsic fluorescence featuring quinizarin moieties

An unprecedented class of macrocycles with intrinsic fluorescence consisting of phenolic trimers and quinizarin is developed. Though they are lacking strong hydrogen bonds as observed in calixarenes, the two examples introduced here each adopt a vase-like conformation with all four aromatic units pointing in one direction (syn orientation). This "cone" conformation has been confirmed by NMR spectroscopy, molecular modeling, and X-ray crystallography. The laminar, electron-rich fluorophore as part of the macrocycle allows additional contacts to enclosed guest molecules.

Some reactions of bicyclo[6.1.0]non-4-enes and–133 tricyclo[7.1.0.44,6]decanes

Synthetic pathways toward the saturated skeleton of tetracyclo[4.4.2.02,10.05,7]dodeca-3,8,11-triene (1) or compounds close to it were probed via derivatives of the title carbon skeletons.