Synthesis, Characterization of Pyridyl Heterocyclic Olefins (PHOs) and Activation of Heterocumulenes

摘要

A series of new patterns of heterocyclic olefins (NHOs) based on pyridyl backbone were synthesized. Reactions of pyridyl heterocyclic olefins (PHOs) with heterocumulenes (CO2, CS2, isocyanate, isothiocyanate) afforded two different types of products including addition and insertion products. Insertion products represented rare example in such reactions. The reactivity between PHOs and heterocumulenes was primarily manipulated by the Lewis acidity of the heterocumulenes, while the product stability and selectivity were controlled by both the PHOs and heterocumulenes.