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Issue 16, 2017
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CuO@Fe2O3 catalyzed C1-alkynylation of tetrahydroisoquinolines (THIQs) via A3 coupling and its decarboxylative strategies

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Abstract

C1-Alkynylation of tetrahydroisoquinoline (THIQ) was achieved via the A3 coupling strategy from the reaction of THIQ as a secondary amine, aldehydes and alkynes using the CuO@Fe2O3 nanocatalyst under green reaction conditions. The wide scope of the present method was studied using various aliphatic/aromatic aldehydes and alkynes to afford the corresponding C1-alkynylated products in quantitative yields. Moreover, the present catalytic system was found to be versatile for the decarboxylative A3 coupling strategy with improved progress of reactions by replacing the alkynes with phenylpropiolic acid under optimized conditions. The present catalytic system was found to be robust, magnetically recoverable and recyclable 5 times without significant loss in its activity, offering a low E-factor and high atom economy (AE).

Graphical abstract: CuO@Fe2O3 catalyzed C1-alkynylation of tetrahydroisoquinolines (THIQs) via A3 coupling and its decarboxylative strategies

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Publication details

The article was received on 11 May 2017, accepted on 27 Jun 2017 and first published on 27 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ01618B
Citation: New J. Chem., 2017,41, 8341-8346
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    CuO@Fe2O3 catalyzed C1-alkynylation of tetrahydroisoquinolines (THIQs) via A3 coupling and its decarboxylative strategies

    U. Gulati, S. Rawat, U. C. Rajesh and D. S. Rawat, New J. Chem., 2017, 41, 8341
    DOI: 10.1039/C7NJ01618B

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