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 2,6-Di(arylamino)-3-fluoropyridine Derivatives as HIV Non-Nucleoside Reverse Transcriptase Inhibitors, published in 2016-03-10, which mentions a compound: 52208-50-1, Name is 2,6-Dichloro-3-fluoropyridine, Molecular C5H2Cl2FN, Quality Control of 2,6-Dichloro-3-fluoropyridine.
New non-nucleoside reverse transcriptase inhibitors (NNRTI), which are similar in structure to earlier described di(arylamino)pyrimidines but featuring a 2,6-di(arylamino)-3-fluoropyridine, 2,4-di(arylamino)-5-fluoropyrimidine, or 1,3-di(arylamino)-4-fluorobenzene moiety instead of a 2,4-disubstituted pyrimidine moiety, are reported. The short and practical synthesis of novel NNRTI relies on two sequential Pd-catalyzed aminations as the key steps. It is demonstrated through direct comparison with reference compounds that the presence of a fluorine atom increases the in vitro anti-HIV activity, both against the wild type virus and drug-resistant mutant strains. Three compounds, e.g., I, were found to display E50 close to 1.0 nM and a very high selectivity index (>40000).
In some applications, this compound(52208-50-1)Quality Control of 2,6-Dichloro-3-fluoropyridine is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.
Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem