Five-membered heterocycles with two heteroatoms may be considered to be derived from pyrrole, furan and thiophene by the replacement of −CH= group by sp2-hybridized azomethine nitrogen (pyridine-type nitrogen) at the position-2 (α) or −3 (β)....
CITATION STYLE
Gupta, R. R., Kumar, M., & Gupta, V. (1999). Five-Membered Heterocycles with Two Heteroatoms. In Heterocyclic Chemistry (pp. 357–486). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-662-07757-3_4
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