The copper particles, supported on Al2O3 were for the first time used as heterogeneous, highly active, easily available, and recyclable copper catalyst of direct carboxylation of various terminal alkynes with CO2 (2 bar) in the presence of cesium carbonate, allowing for the synthesis of alkyl 2-alkynoates. The catalyst contains large-scale CuNPs covered by oxide layer and less prone to erosion, resulting in its high selectivity and efficiency unusual for the particles of this size.