Solvent-free synthesis of α,β-acetylenic ketones by chitosan-2-thiophenecarbaldhyde supported palladium complex under air conditions

During the last decade, acylation of terminal alkynes and acyl chlorides for synthesis of α,β-acetylenic ketones have attracted great attention.1 Ynones or α,β-acetylenic ketones have applicated as intermediates for the synthesis heterocyclic compounds.2 Moreover, ynones have been utilized in preparation biologically active molecules, natural products and pharmaceuticals.3 Recently, the heterogeneous catalyst based palladium and copper have utilized for synthesis of α,β-acetylenic ketones. Moreover, magnetically recoverable nanoparticles have attracted much attention as heterogeneous catalysts due to their inherent properties, such as simple handling, large surface area, and recovery with magnetic separation in various organic reactions.4 Herein, we have reported an environmental magnetic porous chitosan-2-thiophenecarbaldhyde supported palladium complex (Fe@CS-TCp-Pd), which was efficiently used as a heterogeneous catalyst for synthesis of ynones. The catalyst shows not only high catalytic activity, but also offers many practical advantages such as recyclability, simple separation with magnetic external and low catalyst loading without used from solvent. All the products were characterized by IR, 1H and 13C NMR spectroscopy.

کلیدواژه ها:

Palladium complex ، α ، β-acetylenic ketones ، Acylation Reaction ، Chitosan