N-Acylation of amides with acid anhydrides by way of dual activation using MgBr2·OEt2
摘要:
A new practical method for the N-acylation of amides is described. Acylation of various amides with acid anhydrides in the presence of MgBr2.OEt2 gave the corresponding N-acylamides in good to moderate yields. The present method is applicable to amides that are labile to acids or bases. (C) 2002 Elsevier Science Ltd. All rights reserved.
Expanding the Scope of the Acyl-Type Radical Addition Reactions Promoted by SmI<sub>2</sub>
作者:Jakob Karaffa、Karl B. Lindsay、Troels Skrydstrup
DOI:10.1021/jo061299s
日期:2006.10.1
N-Acyl oxazolidinones of simple carboxylic acids and amino acids were observed to undergo successful SmI2-promoted couplings with substituted acrylamides and acrylates, affording a variety of functionalized γ-ketoamides and -esters with yields attaining 85%. As many of these reductive couplings were previously found to be ineffective employing the corresponding 4-pyridylthio esters, the applicability
Importance of C−N Bond Rotation in <i>N</i>-Acyl Oxazolidinones in their SmI<sub>2</sub>-Promoted Coupling to Acrylamides
作者:Rolf H. Taaning、Karl B. Lindsay、Birgit Schiøtt、Kim Daasbjerg、Troels Skrydstrup
DOI:10.1021/ja903401y
日期:2009.7.29
correlates with the activation barriers for C-N bond rotation may have implications for other useful synthetic organic reactions involving similar substrates. Finally, these studies were extrapolated to understanding the poor reactivity of N-acyl oxazolidinones, as those derived from Evans chiral auxiliaries, with N-tert-butyl acrylamide. These couplings appear to be dominated by the activation energy for addition
Can Decarbonylation of Acyl Radicals Be Overcome in Radical Addition Reactions? En Route to a Solution Employing <i>N</i>-Acyl Oxazolidinones and SmI<sub>2</sub>/H<sub>2</sub>O
作者:Christina M. Jensen、Karl B. Lindsay、Rolf H. Taaning、Jakob Karaffa、Anna Mette Hansen、Troels Skrydstrup
DOI:10.1021/ja050420u
日期:2005.5.1
The application of acyl radicals in radical addition reactions in the absence of a CO atmosphere is generally limited to aryl or alpha-unsubstituted alkyl acyl radicals due to competing decarbonylations where the rate constant for this degradation process surpasses 104 s-1. In this work, a potential solution to avoid the problem of decarbonylations is presented employing N-acyl oxazolidinones which
Mechanistic Evidence for Intermolecular Radical Carbonyl Additions Promoted by Samarium Diiodide
作者:Anna Mette Hansen、Karl B. Lindsay、P. K. Sudhadevi Antharjanam、Jakob Karaffa、Kim Daasbjerg、Robert A. Flowers、Troels Skrydstrup
DOI:10.1021/ja060553v
日期:2006.8.1
In this work, mechanisticstudies were performed to understand the SmI2/H2O-mediated coupling of N-acyl oxazolidinones with acrylates and acrylamides, providing gamma-keto esters and amides, respectively. Our results provide experimental evidence that C-C bond formation via intermolecular radical addition reactions to carbonyl substrates can be promoted by samariumdiiodide. Coupling reactions with
The invention provides compounds having the general Formula (I); and pharmaceutically acceptable salts thereof; wherein the variables RA, RAA, subscript n, subscript q, ring A, X2, L, subscript m, X1, R1, R2, R3, R4, R5, D and E have the meaning as described herein, and compositions containing such compounds and methods for using such compounds and compositions.
本发明提供具有通式(I)的化合物;及其药学上可接受的盐;其中变量 RA、RAA、下标 n、下标 q、环 A、X2、L、下标 m、X1、R1、R2、R3、R4、R5、D 和 E 具有本文所述的含义,以及含有此类化合物的组合物和使用此类化合物及组合物的方法。