Lewis Acid-Catalyzed 1,3-Dipolar Cycloaddition of Bicyclobutanes with Isatogens: Access to Tetracyclic 2‑Oxa-3-azabicyclo[3.1.1]heptanes - Shiksha Deswal; Rohan Chandra Das; Deeptanu Sarkar; Akkattu T. Biju (JACS Au)