複素環合成素材としてのメソイオン化合物

概要

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This review summarizes the authors own works on the use of mesoionic compounds for the preparation of several heterocyclic systems. From six- to ten-membered cyclic conjugated heterocycles have been prepared by the dipolar cycloadditions of mesoionic compounds, and subsequent extrusions and ring expansions of the adducts. Mesoionic compounds react with 7-heteranorbornadiene derivatives to give two aromatic heterocycles by fragmentation of the ylide intermediates resulting from cycloaddition-extrusion. Other reactions covered in-clude [4π + 6π] cycloadditions, preparation of o-quinonoid heterocycles, cycloaddition-extrusion reactions with cumulenes, intramolecular cycloaddition-extrusion reactions, and tandem cycloadditions. Several features of mesoionic compounds as dipolar building blocks of heterocycles are briefly discussed.
社団法人有機合成化学協会の論文