Pd@GO catalyzed stereo- and regio-selective addition of arenes to alkynes and synthesis of coumarins C-H functionalization.

A stereo- and regio-selective addition of arenes to alkynes C-H bond functionalization has been developed using palladium nanoparticles supported on graphite oxide (Pd@GO) as the reusable catalyst. The prepared catalyst was characterized by various spectroscopic techniques such as FT-IR, TEM, SEM, EDX, P-XRD, and XPS analysis. The thermal stability of the catalyst was established by TGA.

A sustainable avenue for the synthesis of propargylamines and benzofurans using a Cu-functionalized MIL-101(Cr) as a reusable heterogeneous catalyst.

A heterogeneous copper-catalyzed A coupling reaction of aldehydes, amines, and alkynes for the synthesis of propargylamines and benzofurans has been developed. Here, the modified metal-organic framework MIL-101(Cr)-SB-Cu complex was chosen as the heterogeneous copper catalyst and prepared via post-synthetic modification of amino-functionalized MIL-101(Cr). The structure, morphology, thermal stability, and copper content of the catalyst were determined by FT-IR, PXRD, SEM, TEM, EDX, TGA, XPS, and ICP-OES.

Versatile and Sustainable Approach to Access Biologically Relevant Chromeno[2,3-]pyridine and Benzylpyrazolyl Coumarin Derivatives Using Graphitic Carbon Nitride as a Reusable Heterogeneous Catalyst.

Herein, the synthesis of graphitic carbon nitride (g-CN) via the simple heating of cheap and readily available urea as the starting material has been reported. The catalytic activity of the prepared g-CN was investigated for the synthesis of chromeno[2,3-]pyridine and benzylpyrazolyl coumarin derivatives in an ethanol medium. The reactions were performed under mild conditions to achieve widely functionalized target products in a one-pot operation.