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

[ Vol. 17 , Issue. 6 ]

Author(s):

Dolly Kale, Gajanan Rashinkar, Audumbar Patil, Arjun Kumbhar and Rajashri Salunkhe*   Pages 479 - 489 ( 11 )

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.

Affiliation:

Department of Chemistry, Shivaji University, Kolhapur, 416004, M.S., India; 2Padmabhushan Dr. Vasantraodada Patil College, Tasgaon, 416312, M.S., Department of Chemistry, Shivaji University, Kolhapur, 416004, M.S., India; 2Padmabhushan Dr. Vasantraodada Patil College, Tasgaon, 416312, M.S., Department of Chemistry, Shivaji University, Kolhapur, 416004, M.S., India; 2Padmabhushan Dr. Vasantraodada Patil College, Tasgaon, 416312, M.S., Department of Chemistry, Shivaji University, Kolhapur, 416004, M.S., India; 2Padmabhushan Dr. Vasantraodada Patil College, Tasgaon, 416312, M.S., Department of Chemistry, Shivaji University, Kolhapur, 416004, M.S., India; 2Padmabhushan Dr. Vasantraodada Patil College, Tasgaon, 416312, M.S.

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