1,7-Electrocyclic Reactions of α,β,γ,δ-Unsaturated 1,3-Dipoles as a Synthetic Route to Seven-Membered Heterocycles

Abstract

Various seven-membered heterocyclic compounds (monocyclic and annulated) are accessible by means of a general synthetic tool, i. e. 1,7-electrocyclic ring closure of 1,3-dipoles that are α,β, and γ,δ-unsaturated. 1. Introduction 2. Diazoalkenes 3. Nitrile Imines 4. Nitrile Ylides 5. Carbonyl Ylides 6. Other 1,3-Dipoles 7. Concluding Remarks