Reductive Cyclization Reactions to Bicyclic Compounds Using Samarium Diiodide
Motoo Tori and Masakazu Sono
This review covers reports on the one-electron reductive cyclization reactions affording bicyclic compounds, such as hydrindans, perhydronaphthalenes, perhydroguaianes, and other systems including five-, six-, seven-, and eight-membered carbocycles using SmI2. The substrate is aldehyde, ketone, or ester. The effect of additives, such as H2O, MeOH, HMPA, and NiI2, was studied. The mechanistic aspects recently investigated are also introduced.