The content of this study dedicated to seven-membered heterocycles containing 1,3,5 heteroatoms is organized according to the type of 1,3,5 triheteropine ring system and the selected studies published since 2008. New synthetic methods for preparing monocyclic and fused seven-membered heterocyclic compounds containing 1,3,5 heteroatoms (N, O, and/or S) are addressed such as triazepine, triazepane, oxadiazepine, oxadiazepane, thiadiazepine, dioxazepine, dithiazepane, and dioxathiepine. Fully and partially saturated heterocycles are considered.