Reactions of N-aryl nitrogen oxides. 1. Selective ortho chlorination in the reactions of aryl nitrones and amine oxides with thionyl chloride or phosgene
Aldimines, generated in situfrom arylamines and aryl aldehydes, undergo smooth cycloaddition with cyclopropane-1,1-dicarboxylate in the presence of the cerium(III) chloride heptahydrate-lithium iodide reagent system in refluxing acetonitrile under neutral conditions to produce the corresponding N-arylpyrrolidines in good yields with high selectivity. cerium(III) reagents - aldimines - cyclopropanedicarboxylate
Transfer Hydrogenation of Ketones and Imines with Methanol under Base-Free Conditions Catalyzed by an Anionic Metal–Ligand Bifunctional Iridium Catalyst
作者:Rongzhou Wang、Xingyou Han、Jing Xu、Peng Liu、Feng Li
DOI:10.1021/acs.joc.9b02957
日期:2020.2.21
An anionic iridium complex [Cp*Ir(2,2'-bpyO)(OH)][Na] was found to be a general and highly efficient catalyst for transfer hydrogenation of ketones and imines with methanol under base-free conditions. Readily reducible or labile substituents, such as nitro, cyano, and ester groups, were tolerated under present reaction conditions. Notably, this study exhibits the unique potential of anionic metal-ligand