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 Reactivity and regioselectivity in Stille couplings of 3-substituted 2,4-dichloropyridines, published in 2011-01-26, which mentions a compound: 442903-28-8, Name is Methyl 2,4-dichloronicotinate, Molecular C7H5Cl2NO2, Computed Properties of C7H5Cl2NO2.
The influence of substituents at C-3 of 2,4-dichloropyridines on their reactivity and regioselectivity in Pd-catalyzed cross-couplings is studied. As a model reaction, the (Ph3P)2PdCl2-catalyzed Stille coupling between 2-furyl(tributyl)tin and pyridines is chosen. Increased electron-withdrawing ability of a substituent at the pyridine 3-position improves the overall reactivity. Absolute selectivity for coupling at C-2 is achieved with an amino group at C-3, and the selectivity is totally reversed when the amino group is exchanged for a nitro substituent.
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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics