Construction of preorganized polytopic ligands via palladium-promoted cross-coupling reactions

摘要

Rigid preorganized multitopic ligands have been designed and synthesized. The pd(0)-catalyzed cross-coupling reaction between ethynylated derivatives of bipyridine or terpyridine and the corresponding bipyridine or terpyridine halides or triflates provide access to various homo-ditopic, hetro-ditopic, homo-tritopic and hetero-tritopic ligands bearing acetylene or diphenylacetylene central units in fair to excellent yields.