Catalytic Hydrogenation of Amides to Amines under Mild Conditions
作者:Mario Stein、Bernhard Breit
DOI:10.1002/anie.201207803
日期:2013.2.18
Under (not so much) pressure: A general method for the hydrogenation of tertiary and secondary amides to amines with excellent selectivity using a bimetallic Pd–Re catalyst has been developed. The reaction proceeds under low pressure and comparatively low temperature. This method provides organic chemists with a simple and reliable tool for the synthesis of amines.
the operationally simple dehydrative condensation of carboxylic acids. This reagent comprises an ATD core and DMAP as the leaving group, which is liberated into the reaction system to accelerate acyltransfer reactions. Upon adding ATD-DMAP to a mixture of carboxylic acids and alcohols in the presence of an amine base, the corresponding esters were formed rapidly at room temperature. Moreover, dehydrative
开发了一种新的基于三嗪二酮的试剂 ( N , N'-二烷基)三嗪二酮-4-(二甲氨基)吡啶 (ATD-DMAP),用于操作简单的羧酸脱水缩合。该试剂包含一个ATD核和作为离去基团的DMAP,它被释放到反应体系中以加速酰基转移反应。在胺碱存在下将 ATD-DMAP 添加到羧酸和醇的混合物中,在室温下迅速形成相应的酯。此外,使用 ATD-DMAP 使羧酸和胺之间的脱水缩合以高产率进行。
<i>N</i>-Acyl-<i>N</i>-(4-chlorophenyl)-4-nitrobenzenesulfonamides: highly selective and efficient reagents for acylation of amines in water
been developed as chemoselective N-acylation reagents. Selective protection of primary amines in the presence of secondary amines, acylation of aliphatic amines in the presence of aryl amines, and monofunctionalization of primary-secondary diamines as well as selective N-acylation of amino alcohols using these reagents are described. All of the acylation reactions were carried out in water as a green
An enzymatic method to produce N-acyl homoserinelactones (AHLs) is described. This report represents the first example of the synthesis of bioactive AHLs using immobilized Candida antarctica lipase as the catalyst. The reaction yields, evaluated by GC-EIMS, ranged from 6 to 99%.Graphical Abstract
A Novel Dehydrazination Reaction. V. The Formation of Various Amides from Aliphatic and Aromatic Carboxylic Acid Hydrazides in the Presence of Chloral
作者:Tetsuji Kametani、Osamu Umezawa
DOI:10.1248/cpb.14.369
日期:——
In the previous papers the reactions between aromatic, aliphatic and heterocyclic carboxylic acid hydrazides and either chloral or bromal in various alcohols were attempted and respective esters were obtained. In this paper the reactions of aromatic and aliphatic acid hydrazide with chloral in the presence of various amines were examined, leading eventually to reveal the formation of our expected acid amides as are shown in Table I and II. The intermediates in this reaction, 1-benzoyl-2-(2, 2, 2-trichloroethylidene) hydrazine (III : R=C6H5-, X=Cl) was found to form the amides (VI) when heated in amines. This fact indicated that the acid hydrazides converted to their amides through III.