ChemInform Abstract: Organocatalytic Enantioselective Formal [4 + 2] Cycloaddition of Enones with Cyclic N‐Sulfonylimines and Methylene Chromene for Chiral Spirocyclic Compounds. Issue 13 (March 2016) - Fei, Jie; Qian, Qingqing; Sun, Xiaohua; Gu, Xiaodong; Zou, Chuncheng; Ye, Jinxing