Synthesis of 1‑Substituted Bicyclo[2.1.1]hexan-2-ones via a Sequential SmI₂‑Mediated Pinacol Coupling and Acid-Catalyzed Pinacol Rearrangement Reaction

A two-step procedure, combining a SmI₂-mediated transannular pinacol coupling reaction with an acid-catalyzed pinacol rearrangement process, was employed to prepare a diverse range of 1-substituted bicyclo[2.1.1]hexan-5-ones from cyclobutanedione derivatives. To underscore the significance of these bicyclic ketones in drug synthesis, an sp³-rich analog of nitazoxanide, a well-known antiparasitic and antiviral agent, was synthesized.