The synthesis of the shape-persistentmacrocycles 10a and 10b with two bipyridineunits in opposing sides by Hagihara/Sonogashira cross-coupling chemistry of suitably functionalized building blocks is reported. X-ray analysis of single crystals of 10b shows a layered structure with channels filled with solvent molecules and parts of the flexible chains. with which the cycle is decorated for solubility
The 330 mg to 12 g scale synthesis of a variety of arylene (3,5−8) and hetarylene buildingblocks with bipyridine (16,17,19) and terpyridineunits (21−23,25) by and for transition metal-mediated cross-coupling reactions is reported. All these compounds carry hexyloxymethyl substituents, mainly for solubility reasons.
The 0.3-5 g scale syntheses of the 2,2':6',2 "-terpyridines 3, 6, 9, and 10 are described. The pyridine units are connected to one another by Pd-catalyzed cross-coupling reactions. This method allows the easy introduction of halogen, stannyl, and boronic ester functionalities at positions C-5 and C-5 "; this results in a novel functionality pattern for terpyridines that considerably widens the applicability of this class of tridentate ligands for supra- and macromolecular applications. The feasibility of growth reactions with these novel terpyridines was demonstrated by the synthesis of compounds 12a-c.
Lehmann, Uwe; Dieter Schlueter, European Journal of Organic Chemistry, 2000, # 20, p. 3483 - 3487