Iridium-Catalyzed Amidation of <i>In Situ</i> Prepared Silyl Ketene Acetals to Access α-Amino Esters
作者:Yunyeong Gwon、Minhan Lee、Dongwook Kim、Sukbok Chang
DOI:10.1021/acs.orglett.1c04376
日期:2022.2.4
Disclosed herein is a convenient Ir-catalyzed amidation of esters to access α-amido esters. Initially prepared silyl ketene acetals are directly employed, without separate purification, for subsequent amidation with an oxycarbonylnitrenoid precursor using the Cp*(LX)Ir(III) catalyst. The α-amidation was facile for both α-aryl and α-alkyl esters. Density functional theory studies revealed that the generation
本文公开了一种方便的Ir催化酰胺化酯以获得α-酰胺酯。最初制备的甲硅烷基乙烯酮缩醛无需单独纯化即可直接用于随后使用 Cp*(LX)Ir(III) 催化剂与氧羰基氮烯前体进行酰胺化。α-酰胺化对于 α-芳基和 α-烷基酯都是容易的。密度泛函理论研究表明,在氮烯前体的 N-O 键断裂过程中,反阳离子添加剂的螯合促进了推定的 Ir-nitrenoid 的产生。