LiClO4 Accelerated Michael addition of amines to α,β-unsaturated olefins under solvent-free conditions
摘要:
Several primary and secondary amines were added to alpha,beta-unsaturated esters, nitriles, amides, and ketones to give the corresponding saturated amines mediated by solid lithium perchlorate under solvent-free and environmentally friendly conditions at room temperature. (C) 2003 Elsevier Ltd. All rights reserved.
Mannich-type reactions of aldehydes with secondary amines and a ketene silyl acetal were promoted by trimethoxyborane in DMSO to afford the corresponding β-amino esters in good yields. B(OMe)3 also promoted Ugi-typereactions ofaldehydes with secondary amines and isocyanides in 1,2-dichloroethane, which leads to the formation of α-amino amides. In these reactions, trimethoxyborane serves as an inexpensive
Diarylborinic Acid Derivatives as a Catalytic Iminium Ion Generator in the Mannich-Type Reaction Using Secondary Amines, Aldehydes, and Ketene Silyl Acetals
作者:Michinori Suginome、Yusuke Tanaka、Tomoaki Hasui
DOI:10.1055/s-2008-1072724
日期:2008.5
Reactions of secondary amines, aldehydes, and ketene silyl acetals were efficiently promoted by catalytic amounts of diarylborinic acid esters, Ar 2 B(OR), affording β-amino esters selectively with no formation of the corresponding β-hydroxy esters.
催化量的二芳基硼酸酯 Ar 2 B(OR) 有效地促进了仲胺、醛和乙烯酮甲硅烷基缩醛的反应,选择性地提供了 β-氨基酯,而不会形成相应的 β-羟基酯。
Bromodimethylsulfonium bromide mediated Michael addition of amines to electron deficient alkenes
作者:Abu T. Khan、Tasneem Parvin、Sarifuddin Gazi、Lokman H. Choudhury
DOI:10.1016/j.tetlet.2007.03.163
日期:2007.5
Bromodimethylsulfonium bromide has been found to be an efficient catalyst for the Michael addition of a wide variety of amines to electron deficient alkenes at room temperature. The protocol is very simple and chemoselective. Aliphatic and benzylic amines undergo conjugate addition within a very short period under solvent-free conditions and provide excellent yields of products. (C) 2007 Published by Elsevier Ltd.
Aminoboranes as “Compatible” Iminium Ion Generators in Aminative C−C Bond Formations
Aminoboranes have been shown to be highly efficient and mild iminium ion generators in the Mannich-type aminative coupling of aldehydes with silyl ketene acetals. By using aminoboranes bearing bulky amino groups, such as a diisopropylamino group, free secondary amines can be successfully used as the amino component in a three-component Mannich reaction with aldehydes and silyl ketene acetals.
Aminoalkylation with Aldehydes Mediated by Solid Lithium Perchlorate
作者:Mohammad R. Saidi、Mohammad Nazari
DOI:10.1007/s00706-003-0093-2
日期:2004.3.1
The solid LiClO4-mediated one-pot reaction of aldehydes with secondary amines and C nucleophiles afforded the corresponding aminoalkylation products in high yields. Unlike the previous reported procedure, the aminoalkylation of aldehyde was achieved in the presence of only 0.5 equivalents of solid lithium perchlorate in dichloromethane as the solvent with good to high yields at room temperature.