Hypervalent iodine in the structure of N-heterocycles: synthesis, structure, and application in organic synthesis

The review is devoted to one of the most substantial trends in the chemistry of hypervalent iodine – synthesis, structure, and properties of heterocyclic and pseudoheterocyclic systems based on λ 3 - and λ 5 -iodanes. Among the variety of cyclic reagents based on hypervalent iodine, special attention has recently been paid to iodanes having close contact between I and N atoms. The review is addressing the synthetic approaches, structural features, and application of these reagents. The review includes more than 100 literature sources, mainly covering publications from 1990 to 2020 and key research from earlier years.