Nucleophilic and acid catalyst behavior of a protic ionic liquid in a molecular reaction media. Part 1
作者:Claudia G. Adam、Graciela G. Fortunato、Pedro M. Mancini
DOI:10.1002/poc.1501
日期:2009.5
achieve this, a kinetic study of nucleophilicaromaticsubstitution reactions between 1‐fluoro‐2,4‐dinitrobenzene and 1‐butylamine or piperidine was developed in this type of binary mixtures. We have detected nucleophiles competition originated by the presence of the ionic solvent at very low concentrations, observing the ethylamine derivative as the main substitution product. Moreover, in the light
Quantitative Solid-State Reactions of Amines with Carbonyl Compounds and Isothiocyanates
作者:Gerd Kaupp、Jens Schmeyers、Juergen Boy
DOI:10.1016/s0040-4020(00)00511-1
日期:2000.9
solid anhydrides to give diamides (therefrom imides) or amidic carboxylic salts or imides, with solid imides to give diamides, with solid lactones or carbonates to give functionalized carbamic esters, with polycarbonates to give degradative aminolysis, and with solid isothiocyanates to give thioureas. Diamides give imides by solid-state thermolysis or acid catalysis. Various double, two-step, 3-cascade
Autoxidation reactions of imines to form oxaziridines and amides
作者:Barbara J. Auret、Derek R. Boyd、Peter B. Coulter
DOI:10.1039/c39840000463
日期:——
The formation of oxaziridines and the isomeric amides in equal amounts by the spontaneous autoxidation of several liquid imines via peroxyimidic acid intermediates is reported.
Aromatic aldehyde-catalyzed gas-phase decarboxylation of amino acid anion via imine intermediate: An experimental and theoretical study
作者:Zhang Xiang
DOI:10.1016/j.molstruc.2013.06.046
日期:2013.10
catalytic effect. Moreover, the catalytic mechanism varies according to the type of amino acid: (i) The decarboxylation of α-amino acid anion is determined by the direct dissociation of the C C bond adjacent to the carboxylate, for the resulting carbanion can be well stabilized by the conjugation between α-carbon, C N bond and benzene ring. (ii) The decarboxylation of non-α-amino acid anion proceeds
摘要 人们普遍认为羰基化合物可以促进氨基酸的脱羧。在本文中,我们基于串联质谱 (MS/MS) 技术和密度泛函理论,对芳香醛催化的氨基酸阴离子通过亚胺中间体的气相脱羧进行了实验和理论研究。 (DFT) 计算。结果表明,芳香醛可以达到显着的催化效果。此外,催化机制因氨基酸类型而异:(i) α-氨基酸阴离子的脱羧是由与羧酸盐相邻的 CC 键的直接解离决定的,因为生成的碳负离子可以通过α-碳、CN 键和苯环之间的共轭。(ii) 非α-氨基酸阴离子的脱羧通过类似 SN 2 的过渡态进行,其中与羧酸盐相邻的 CC 键的解离和生成的碳负离子对 CN 键或苯环的攻击发生同时。具体来说,对于 β-丙氨酸,生成的碳负离子优先攻击苯环导致苯阴离子,因为在脱羧过程中攻击 CN 键会产生不稳定的三元或四元环阴离子。对于其他非 α-氨基酸阴离子,CN 键优先参与脱羧,从而导致生成小分子氮阴离子。其中与羧酸盐相邻的 CC
Gold(I)-Catalyzed Benz[<i>c</i>]azepin-4-ol Synthesis by Intermolecular [5 + 2] Cycloaddition
作者:Naseem Iqbal、Anne Fiksdahl
DOI:10.1021/jo401075n
日期:2013.8.16
N-heterocyclic azepine products is presented. A number of benz[c]azepin-4-ol products were readily prepared in one step from easily accessible phenylpropargyl acetals and benzaldimine substrates in the presence of a gold(I) catalyst. A direct one-pot procedure from the propargyl and the respective aldehyde and amine substrates was successful as well. The reaction to access the benzofused azepines could be
介绍了一种金(I)催化的分子间缩甲醛[2 + 5]环加成反应,用于制备苯并稠合的N-杂环氮杂产物。在金(I)催化剂的存在下,很容易从容易获得的苯基炔丙基缩醛和苯甲二胺底物中一步制备许多苯并[ a ]氮杂-4-醇产物。炔丙基以及相应的醛和胺底物的直接一锅法也很成功。可以通过级联反应(包括亲核性苯扎二胺N)合理化获得苯并稠合氮杂物的反应-从炔丙基缩醛生成的高反应性苯基炔丙基-金(I)类胡萝卜素复合物上进行攻击。随后的脱脂步骤通过与醛亚胺部分的分子内Pictet-Spengler型反应,通过1,7-电环化促进环的闭合。