Enantioselective Construction of Dihydropyran‐Fused Indoles through Chiral Calcium Phosphate Catalyzed Oxo‐Hetero‐Diels–Alder Reactions by Using 2‐Oxoindolin‐3‐ylidenes as Heterodienes
1. School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093 (China), Fax: (+86) 25‐83594886;2. Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032 (China)