Selective Synthesis of Eight-Membered Cyclic Ureas by the [6 + 2] Cycloaddition Reaction of 2-Vinylazetidines and Electron-Deficient Isocyanates
作者:Shunsuke Koya、Kenichi Yamanoi、Ryu Yamasaki、Isao Azumaya、Hyuma Masu、Shinichi Saito
DOI:10.1021/ol902299p
日期:2009.12.3
The [6 + 2] cycloaddition reaction of 2-vinylazetidines with electron-deficient isocyanates such as tosyl Isocyanate proceeded smoothly in the absence of the catalyst at room temperature, and various cyclic ureas were isolated in good to high yields. Electron-deficient allenes also reacted with the 2-vinylazetidine, and the corresponding azocine derivatives were isolated.