Endocyclic sulfoximines are a relatively novel class of cyclic sulfoximines where
the S(O)=N group is a part of a ring structure. They possess unique physicochemical
and structural features, including three-dimensionality and chirality, amid chemical
and thermal stability. This graphical review presents a comprehensive compilation
of synthetic approaches toward endocyclic sulfoximines, organized by the type of reaction
employed. The reaction conditions are presented in the most detailed way; the proposed
reaction mechanisms and the catalytic cycles are also provided.