An efficient and recyclable silica-supported carbene-Cu(II) catalyst for the oxidative coupling reaction of terminal alkynes with H-phosphonates under base-free reaction conditions

摘要

The oxidative coupling reactions of terminal alkynes with H-phosphonates were explored using SiO2 -NHC Cu(II) (5.0 mol%) as catalyst at room temperature under base-free reaction conditions. The reactions of a variety of terminal alkynes with H-phosphonates generated the corresponding alkynylphosphonate products in good to excellent yields. In addition, SiO2-NHC-Cu(II) could be recovered and recycled for six consecutive trials without significant loss of its reactivity.