In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called A divergent and selective synthesis of isomeric benzoxazoles from a single N-Cl imine, published in 2011-12-02, which mentions a compound: 6797-13-3, Name is 2-Ethylbenzo[d]oxazole, Molecular C9H9NO, Application In Synthesis of 2-Ethylbenzo[d]oxazole.
A divergent and regioselective synthesis of either 3-substituted benzoisoxazoles or 2-substituted benzoxazoles from readily accessible ortho-hydroxyaryl N-H ketimines is described. The reaction proceeds in two distinct pathways through a common N-Cl imine intermediate: (a) N-O bond formation to form benzoisoxazole under anhydrous conditions and (b) NaOCl mediated Beckmann-type rearrangement to form benzoxazole, resp. The reaction path also depends on the electronic nature of the aromatic ring, with the electron-rich aromatic rings favoring the rearrangement and the electron-deficient rings favoring the N-O bond formation. A Beckmann-type rearrangement mechanism via net [1,2]-aryl migration for the formation of 2-substituted benzoxazole is proposed.
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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem