Add time:07/11/2019         Source:sciencedirect.com

The chemistry of N,N′-bisazaheterocycles is gaining importance recently because of their potential role in (1) widening the available pool of chiral auxiliaries in asymmetric synthesis; (2) discovering new molecules as drug candidates; (3) developing organic polymers for use in light harvesting devices; and (4) unraveling the molecular mechanics and bioactivity of cyclic aminyl radicals. The synthetic approaches to these compounds, reported in literature till August 2014, are summarized in this chapter. For this purpose, N,N′-bisazaheterocycles have been classified as “symmetrical” (A–A type) and “unsymmetrical” (A–B type), based on whether the heterocyclic rings present on either side of the N–N bond in the molecule are same or different. Accordingly, the synthesis and importance of N,N′-biaziridines (with ring sizes being 3–3), biazetidine (4–4), biazoles (5–5), biazines (6–6), biazepanes (7–7), and aziridinyl azoles (3–5), aziridinyl azines (3–6), azetidinyl azoles (4–6), azetidinyl azines (4–6), azolyl azoles (5–5′), azolyl azines (5–6), azolyl azepines (5–7), azolyl azocanes (5–8), azinyl azines (6–6′), azinyl azepines (6–7) are discussed.

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