Metal‐free Synthesis of Spiro‐2,2′‐benzo[b]furan‐3,3′‐ones via PhI(OAc)2‐Mediated Cascade Spirocyclization. - Xing, Qingyu; Liang, Huiyuan; Bao, Mingmai; Li, Xuemin; Zhang, Jingran; Bi, Tianhao; Zhang, Yilin; Xu, Jun; Du, Yunfei; Zhao, Kang (Advanced Synthesis & Catalysis, 2019)