Recyclable gold(I)-catalyzed oxidative cyclization of 1,4-diyn-3-ols leading to highly substituted 3-formylfurans
作者:Xiaoqiang Xiao、Siqi Liu、Mingzhong Cai
DOI:10.1016/j.jorganchem.2022.122527
日期:2022.12
An efficient heterogeneous gold(I)-catalyzed cascade oxidation/1,2-alkynyl migration/cyclization reaction of 1,4-diyn-3-ols has been developed. The reaction proceeds effectively in toluene at room temperature by using 3 mol% of MCM-41-anchored sterically demanding NHC-gold(I) complex [MCM-41-IPrAuOTf] as catalyst and 3,5-dichloropyridine N-oxide as oxidant and offers a general and practical route for
开发了一种高效的非均相金 (I) 催化级联氧化/1,2-炔基迁移/1,4-diyn-3-ols 的环化反应。以 3 mol% 的 MCM-41 锚定的空间要求高的 NHC-gold(I) 配合物 [MCM-41-IPrAuOTf] 作为催化剂,3,5-二氯吡啶N-氧化物作为氧化剂,反应在室温下在甲苯中有效进行。为从容易获得的起始材料合成多种 3-甲酰基呋喃提供了一种通用且实用的途径,其产率从良好到极好。这种异质化的金 (I) 催化剂可以通过简单的离心过程轻松回收,并且可以重复使用六次以上,而不会显着降低其催化效率。