Metal–organic framework-covered stainless steel mesh as a novel heterogeneous catalyst in multi-component reaction

The stainless steel mesh was covered by MOF-199 and applied in the four-component synthesis of 2-aminospiro[indeno[1,2-b]quinoxalin-11,4-pyran]-3-carbonitriles as a novel and efficient heterogeneous catalyst. The preparation of MOF-199-covered stainless steel mesh (MOF-199@SSM) was confirmed by FT-IR, FE-SEM and DEX analyses. MOF-199@SSM catalyst can be easily separated from the reaction mixture by simple forceps and reused. The stability of the catalyst was examined using a hot filtration test and no leaching occurred during the reaction. The reactions conditions were mild and the reaction times were relatively short. No by-product was produced, so, high purity and high yields of products were obtained.