Gold-Catalyzed Formal [3 + 2] Cycloaddition of Ynamides with 4,5-Dihydro-1,2,4-oxadiazoles: Synthesis of Functionalized 4-Aminoimidazoles
作者:Wei Xu、Gaonan Wang、Ning Sun、Yuanhong Liu
DOI:10.1021/acs.orglett.7b01469
日期:2017.6.16
A gold-catalyzed formal [3 + 2] cycloaddition of ynamides with 4,5-dihydro-1,2,4-oxadiazoles has been developed. The reaction provides a concise and regioselective access to highly functionalized 4-aminoimidazoles likely via the formation of an α-imino gold carbene intermediate followed by cyclization. 4,5-Dihydro-1,2,4-oxadiazole was found to act as an efficient N-iminonitrene equivalent in these
已经开发了金催化的酰胺与4,5-二氢-1,2,4-恶二唑的正式[3 + 2]环加成反应。该反应可能通过形成α-亚氨基金卡宾中间体然后环化而提供对高度官能化的4-氨基咪唑的简洁和区域选择性的途径。发现在这些反应中4,5-二氢-1,2,4-恶二唑可作为有效的N-亚氨基亚硝基当量。