Aryl/Hetero-Aryl Tosylates as Coupling Partners in Metal Mediated Suzuki and Hiyama Cross-Coupling Reactions in Ionic Liquids: Facile Synthesis of Biaryls/Heterobiaryls

Abstract

Diverse libraries of biaryls/heterobiaryls were synthesized by aryl/hetero-aryl tosylates as coupling partners in the ligand-free, Ni-catalyzed Suzuki coupling reaction and Pd-catalysed Hiyama cross-coupling reaction in ionic liquids (ILs) as green solvent. In this method easily available and economically viable Tosylates were coupled with readily available boronic acids and phenyltriethoxysilanes in Suzuki and Hiyama cross-coupling respectively to yield the corresponding biaryls/heterobiaryls. Mild reaction condition(s), easy workup, moderate to excellent yield of the isolated pure products, wide substrate scope, and recycling/reuse of the ILs are the advantages of this method over the other reported methods.

Keywords: aryl/hetero-aryl tosylates, Biaryls, Cross-Coupling Reactions, green chemistry, Ionic Liquids