Metal–Organic Framework Derived Cobalt Oxide Supported Bimetallic Pd/Cu Nanoparticles for Efficient Catalysis of the Sonogashira Reaction under Aerobic Conditions

Abstract

A bimetallic Pd/Cu catalyst supported on a metal-organic-framework-derived cobalt oxide was prepared and characterized by SEM, EDS, XRD, XPS, and ICP-OES analyses. The catalyst promoted the Sonogashira reaction of aryl iodides with terminal alkynes at a low loading of the palladium (0.032 mol%) and copper species (0.012 mol%) to give the corresponding disubstituted alkynes in moderate to good yields. When the catalyst was recovered by using an external magnetic field, its catalytic activity decreased slightly in a second cycle.

Key words

Sonogashira reaction - palladium catalysis - copper ­catalysis - bimetal catalysis - alkynes - heterogeneous catalysis

Publication History

Received: 06 March 2022

Accepted after revision: 25 July 2022

Article published online:
31 August 2022

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• 39 Sonogashira Reaction of Aryl Iodides 1 with Terminal Alkynes 2: General Procedure A mixture of the appropriate aryl iodide 1 (0.5 mmol), terminal alkyne 2 (0.6 mmol), catalyst B (1.0 mg; 0.032 mol% Pd species, 0.012 mol% Cu species), and K₃PO₄ (1.0 mmol) in EtOH (2.0 mL) was stirred at 80 °C for 24 h under air. When the reaction was complete, the mixture was cooled to rt. The organic phases were concentrated in vacuo, and the resulting crude product was purified by column chromatography (silica gel, hexane–EtOAc). 1-Methyl-3-(phenylethynyl)benzene (3d) Isolated by column chromatography [silica gel, hexane–EtOAc (5:1)], as a yellow liquid; yield: 88%; R_f = 0.7 (hexane–EtOAc, 5:1). ¹H NMR (400 MHz, CDCl₃): δ = 7.50–7.48 (m, 2 H), 7.33–7.28 (m, 5 H), 7.20 (t, J = 7.6 Hz, 1 H), 7.10 (d, J = 7.6 Hz, 1 H), 2.31 (s, 3 H). ¹³C NMR (100 MHz, CDCl₃): δ = 137.98, 132.17, 131.57, 129.14, 128.66, 128.30, 128.22, 128.15, 123.36, 123.05, 89.54, 89.01, 21.12.