Saha, Prasenjit; Ramana, Tamminana; Purkait, Nibadita; Ali, Ashif Md; Paul, Rajesh; Punniyamurthy, Tharmalingam published the article 《Ligand-Free Copper-Catalyzed Synthesis of Substituted Benzimidazoles, 2-Aminobenzimidazoles, 2-Aminobenzothiazoles, and Benzoxazoles》. Keywords: benzimidazole aminobenzimidazole aminobenzothiazole benzoxazole preparation; intramol cyclization bromoaryl derivative copper oxide nanoparticle catalyst.They researched the compound: 2-Ethylbenzo[d]oxazole( cas:6797-13-3 ).Product Details of 6797-13-3. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:6797-13-3) here.
The synthesis of substituted benzimidazoles, 2-aminobenzimidazoles, 2-aminobenzothiazoles, and benzoxazoles is described via intramol. cyclization of o-bromoaryl derivatives using copper(II) oxide nanoparticles in DMSO under air. E.g., cyclization of o-bromoaryl amidine I gave 95% benzimidazoles II. The procedure is exptl. simple, general, efficient, and free from addition of external chelating ligands. It is a heterogeneous process and the copper(II) oxide nanoparticles can be recovered and recycled without loss of activity.
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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem