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PPh3‐Catalyzed Ring‐Expansion Reactions of Sulfamate‐Derived Cyclic Imines with Acetylenedicarboxylates
Authors:Zhilin Yang  Hao Yu  Lei Zhang  Hang Wei  Dr. Yumei Xiao  Lanzhen Chen  Dr. Hongchao Guo
Affiliation:1. Department of Applied Chemistry, Institution China Agricultural University, 2 West Yuanmingyuan Road, Beijing 100193 (China), Fax: (+86)?10‐6281‐5579;2. Bee Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100093, China
Abstract:The PPh3‐catalyzed ring‐expansion reaction of sulfamate‐derived cyclic imines with acetylenedicarboxylates has been developed. The reaction works quite efficiently under very mild conditions to afford benzo[g][1,2,3]oxathiazocine‐4,5‐dicarboxylate 2,2‐dioxide derivatives in high yields.
Keywords:heterocycles  imines  organocatalysis  ring expansion  synthetic methods
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