Facile Access to 2-Substituted Benzoxazoles Using Sawdust Supported N-Heterocyclic Carbene-Ni Complex via C-H Activation

Author(s): Dolly Kale, Gajanan Rashinkar, Audumbar Patil, Arjun Kumbhar, Rajashri Salunkhe*.

Journal Name: Letters in Organic Chemistry

Volume 17 , Issue 6 , 2020

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Abstract:

Sawdust supported N-heterocyclic carbene-nickel complex has been prepared by covalent grafting of 1-methyl imidazole in the matrix of chloropropyl modified sawdust followed by reaction with nickel acetate. The resultant NHC-Ni complex was employed as a heterogeneous catalyst for the synthesis of 2-substituted benzoxazoles from benzoxazole and aryl boronic acids following C-H activation strategy. The recycling experiments showed that the complex could be reused for five consecutive runs without significant loss in the yield of products.

Keywords: C-H activation, N-Heterocyclic carbene, sawdust, benzoxazole, reusability, heterogeneous analogues.

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Article Details

VOLUME: 17
ISSUE: 6
Year: 2020
Page: [479 - 489]
Pages: 11
DOI: 10.2174/1570178616666190705153927
Price: $65

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