Preparation and Thermolysis of<i>N</i>-Ammonioamidates Containing Hydroxyl Group in Acyl Moiety
作者:Araki Masuyama、Kikuo Tsuchiya、Mitsuo Okahara
DOI:10.1246/bcsj.58.2855
日期:1985.10
The title N-ammonioamidates (aminimides) were prepared in satisfactory yields from lactones or α-hydroxy carboxylates. By the thermolysis of these aminimides in mesitylene, some types of urethane compounds were formed, depending on the structure of the aminimide and on the concentration of the solutions.
Intramolecular conversion of N,N-bis(2-picolyl)ureas to cyclic carbamates
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.