Metal ion-induced self-assembly of functionalized 2,6-oligopyridines. 1. Ligand design, synthesis, and characterization
摘要:
Synthetic sequences utilizing alpha-oxoketene dithioacetal and enolate chemistry have been developed for the preparation of new functionalized bipyridines, terpyridines, quaterpyridines, quinquepyridines, sexipyridines, septipyridines, octipyridines, novipyridines, and decipyridines. Obtained in moderate to good yields, these oligopyridines were characterized by analytical and spectral data and, for sexipyridine, by X-ray crystallography.
These molecular strands are shown to adopt helical conformations of 1.5 and 2.5 turns, respectively. The helical shape of 1 has been confirmed and structurally characterized by X-ray crystallography. The results indicate that the pyrimidine-hydrazone unit is a satisfatory helicity codon, so that the facile hydrazone formation provides an efficient procedure for generating helical structures. This