ChemInform Abstract: N‐Heterocyclic Carbene‐Catalyzed [4 + 2] Cyclization of 2‐Bromo‐2‐enal with 3‐Alkylenyloxindoles: Efficient Assembly of Spirocarbocyclic Oxindole. Issue 25 (5th June 2015) - Xie, Yuanwei; Que, Yonglei; Li, Tuanjie; Zhu, Ling; Yu, Chenxia; Yao, Changsheng