Aldehydes vs Aldimines. Unprecedented Aldimine-Selective Nucleophilic Additions in the Coexistence of Aldehydes Using a Lanthanide Salt as a Lewis Acid Catalyst
作者:Shū Kobayashi、Satoshi Nagayama
DOI:10.1021/ja971153y
日期:1997.10.1
It is well-recognized that aldimines are less reactive than aldehydes toward nucleophilic additions. In this paper, an unprecedented change in the reactivity is described: preferential reactions of aldimines over aldehydes in nucleophilic additions using a lanthanide salt as a Lewis acidcatalyst. In the presence of a catalytic amount of ytterbium triflate (Yb(OTf)3), only aldimines reacted with silyl
Highly Efficient One-Pot Three-Component Mannich Reaction in Water Catalyzed by Heteropoly Acids
作者:Najmodin Azizi、Lalleh Torkiyan、Mohammad R. Saidi
DOI:10.1021/ol060498v
日期:2006.5.1
[reaction: see text] Heteropoly acidsefficiently catalyzed the one-pot, three-component Mannichreaction of ketones with aromatic aldehydes and different amines in water at ambient temperature and afforded the corresponding beta-amino carbonyl compounds in good to excellent yields and with moderate diastereoselectivity. This method provides a novel and improved modification of the three-component
Nafion-H®: A recyclable and diastereoselective solid acid catalyst for three-component mannich reaction
作者:Yang Suling、Li Gang、Long Yunling
DOI:10.1134/s0023158412060079
日期:2012.11
One-pot, three-componentMannichreactions of ketones, aldehydes and amines are efficiently catalyzed by heterogeneous Nafion-H® ambient temperature to give the corresponding β-amino ketones compounds in good to excellent yields. The catalyst can be easily recovered and reused without any decrease of activity for at least four times. Diastereoselective products can be obtained in Mannichreaction of aliphatic
Herein, we describe a novel photoinduced iron-catalyzed strategy for multicomponent C–H alkylation of in situ generated imines. By utilizing the alkyl radicals generated through iron-mediated photocatalytic C–H activation, the imines formed in situ are further subjected to addition reactions, resulting in the synthesis of various secondary and tertiary amine products. This method is simple to operate