Heterocycles containing more than One Heteroatom

Simple heterocyclic compounds Three-membered heterocycles containing one heteroatom Oxiranes (epoxides), thiiranes (episulfides), aziridines Three-membered heterocycles containing more than one heteroatom Oxaziridines, dioxiranes, diazirines Four-membered heterocycles containing one heteroatom Oxetanes, thietanes, azetidines... 

Four-membered heterocycles containing more than one heteroatom Dithietanes, dithietes, diazetidines... 

Five-membered non-aromatic heterocycles containing more than one heteroatom 1-Pyrazolines, 1,3-dioxolanes, 2-pyrazolines Five-membered aromatic heterocycles containing one heteroatom Pyrrole, furan, thiophene... 

Partial and Complete Reduction of Heterocycles Containing More Than One Heteroatom... 

Competing C-H insertions become a problem only when attempting to form larger than six-membered heterocycles. This methodology has also proven successful in the construction of heterocycles containing more than one heteroatom such as aza- 3-lactams [78]. 

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