Salen-Ti-Catalyzed Formal [2π+2σ] Cycloadditions of Bicyclo[1.1.0]butanes with AlkenesSalen-Ti催化的双环[1.1.0]丁烷与烯烃的[2π+2σ]形式环加成反应SYNTHESIS-STUTTGARTIF2.32026-04-010PRE