作者:Uwe Jakob、Willi Bannwarth
DOI:10.1016/j.tetlet.2015.09.118
日期:2015.11
Herein, we present a new methodology for preparing 6-membered ring carbamates from a CuI-promoted cyclization of N,N-bis(2-picolyl)amine substituted ureas. The reactions work best in the presence of up to five-fold excess of CuCl at room temperature in a non-nucleophilic solvent such as acetonitrile. Nine examples of the syntheses are presented to yield products in good to excellent amounts.
在这里,我们提出了一种新的方法,用于从Cu I促进的N,N-双(2-吡啶甲基)胺取代的脲的环化反应中制备6元环氨基甲酸酯。在非亲核溶剂(如乙腈)中,在室温下存在多达五倍过量的CuCl时,反应效果最佳。给出了九个合成实例,以产生高至极佳量的产物。