Base-Promoted Annulation of Amidoximes with Alkynes: Simple Access to 2,4-Disubstituted Imidazoles
作者:Hina Mehmood、Muhammad Asif Iqbal、Le Lu、Ruimao Hua
DOI:10.3390/molecules25163621
日期:——
of imidazole ring by a Cs2CO3-promoted annulation of amidoximes with terminal alkynes in DMSO has been developed. This protocol provides a simple synthetic route with high atom-utilization for the synthesis of 2,4-disubstituted imidazoles in good yields under transition-metal-free and ligand-free conditions. Internal alkynes can also undergo the annulation to give 2,4,5-trisubstituted imidazoles.
已开发出通过 Cs2CO3 促进的酰胺肟与 DMSO 中末端炔烃的环化有效构建咪唑环。该协议为在无过渡金属和无配体的条件下以良好的收率合成 2,4-二取代咪唑提供了一种简单的合成路线, 具有高原子利用率。内部炔烃也可以进行环化,得到 2,4,5-三取代的咪唑。