Efficient Construction of Oxa‐ and Aza‐[n.2.1] Skeletons: Lewis Acid Catalyzed Intramolecular [3+2] Cycloaddition of Cyclopropane 1,1‐Diesters with Carbonyls and Imines
State Key Laboratory of Elemento‐Organic Chemistry, Institute of Elemento‐Organic Chemistry, Nankai University, Tianjin 300071 (P. R. China) http://wzw.nankai.edu.cn