Multichromophore arrays of dibenzotetraaza[14]annulene: a promising platform for bioorganic chemistry

The first series of discrete multichromophore arrays of dibenzotetraaza[14]annulene (DBTAA), containing flexible bridges, have been synthesized in 40-46% isolated yields. The key asymmetrical intermediates, carrying two distinctly addressable functionalities (ROH vs. ROCH2-C[triple bond, length as m-dash]C-H and R(CH2)nBr vs. ROCH2-C[triple bond, length as m-dash]C-H) at the macrocycle periphery, were synthesized in moderate to high (30-78%) isolated yields. Facile synthetic protocols developed for the synthesis of discrete DBTAA arrays offer several advantages such as operational simplicity and easy post-synthetic workup that overcome the need for laborious chromatographic purification. All new compounds were characterized by microanalysis, mass spectrometry, UV-Vis, FTIR-ATR, and 1H and 13C NMR spectroscopy. Structural features were briefly discussed with emphasis on several potential applications.

One-flask synthesis of dibenzotetraaza[14]annulene cyclic congeners bearing buta-1,3-diyne bridges

Glaser–Hay and Glaser–Eglinton coupling conditions were applied to the direct synthesis of a cyclic strapped ligand and its corresponding dimer in 44% and 30% yields respectively.

Metal organic frameworks mimicking natural enzymes: a structural and functional analogy

In this review, we have portrayed the structure, synthesis and applications of a variety of biomimetic MOFs from an unprecedented angle.