MODERN APPROACHES FOR SO2 INSERTION IN HETEROCYCLIC SYNTHESIS

Abstract

The most recent advances in the synthesis of heterocyclic compounds via insertion of sulfur dioxide reported from 2015 to 2018 are summarized. Methods described here are organized in several sections depending on the source of SO₂: sodium or potassium metabisulfite (M₂S₂O₅), SO₂ adducts with nitrogen-containing heterocycles DABSO and DMAP·SO₂, ex situ formed SO₂ and intramolecularly released SO₂.