XtalFluor-E, an Efficient Coupling Reagent for Amidation of Carboxylic Acids
摘要:
Amides were produced from carboxylic acids and amines by using XtalFluor-E as an activator. Even poorly reactive carboxylic acids can be transformed to amides. In addition, optically active amines and/or carboxylic acids were not epimerized/racemized during the process.
Kinetic studies were carried out on the aminolysis reactions of substituted aliphatic esters in a variety of aprotic solvents. The reaction rate is strongly affected by inductive and steric effects of substituents in the acyl group, rising more than 10(4)-fold from cyanoacetate to trifluoroacetate. The quantitative treatment of solvent effects revealed a rate decrease by the polarity and pi-basicity of the solvents, and also an accelerating effect of the polarizability of solvents. Cyclic transition states were assumed for both the first and second-order (in amine) reactions. Copyright (C) 1999 John Wiley & Sons, Ltd.
HETEROCYCLIC COMPOUNDS, INTERMEDIATES THEREOF AND ELASTASE INHIBITORS
申请人:Dainippon Pharmaceutical Co., Ltd.
公开号:EP1157998B1
公开(公告)日:2004-02-11
US6835714B1
申请人:——
公开号:US6835714B1
公开(公告)日:2004-12-28
XtalFluor-E, an Efficient Coupling Reagent for Amidation of Carboxylic Acids
Amides were produced from carboxylic acids and amines by using XtalFluor-E as an activator. Even poorly reactive carboxylic acids can be transformed to amides. In addition, optically active amines and/or carboxylic acids were not epimerized/racemized during the process.