Direct Synthesis of Esters from Alkylarenes and Carboxylic Acids: The C–H Bond Dehydroesterification
作者:Jin Zhang、Jianghan Cao、Jiabin Zhou、Jie Zhang、Yinglin Zhao、Zhida Zhang、Renhua Liu
DOI:10.1021/acs.joc.3c00752
日期:2023.7.7
directly esterified by carboxylic acids to produce benzyl esters in high yields is reported. This reaction is catalyzed by Pd nanoparticles (NPs) on N-doped carbon (CN) composites based on a carbonizing Al-MIL-101(NH2) material, and no oxidants or hydrogen acceptors are required. Use of o-alkylbenzoic acids as substrates leads to phthalides, whereas with carboxylic acids and alkylarenes as the feedstock
在此,报道了烷基芳烃的苄基C-H键被羧酸直接酯化以高产率生产苄基酯的反应。该反应由基于碳化Al-MIL-101(NH 2 )材料的N掺杂碳(CN)复合材料上的Pd纳米颗粒(NP)催化,并且不需要氧化剂或氢受体。使用o-烷基苯甲酸作为底物产生苯并呋喃酮,而以羧酸和烷基芳烃作为原料,反应产生苄基酯。这些使用容易获得的烷基芳烃代替卤化苄或苯甲醇作为原料一步合成苄基酯而无需氧化剂的反应本质上是原子效率和步骤效率的。制备了 CN 复合材料和 CN 负载的 Pd NP 催化剂,并对其进行了良好的表征。所提出的机制涉及羧基和苄基的脱氢,以及通过有机钯中间体从苄基中夺氢,将苄基的 C-H 键转化为 C-O 键。动力学同位素效应 ( k H / k D= 2.77) 表明烷烃芳烃的 C(sp 3 )–H 键断裂是速率决定步骤。
Proton-exchanged montmorillonite-mediated reactions of methoxybenzyl esters and ethers
作者:Dongyin Chen、Chang Xu、Jie Deng、Chunhuan Jiang、Xiaoan Wen、Lingyi Kong、Ji Zhang、Hongbin Sun
DOI:10.1016/j.tet.2014.01.064
日期:2014.3
AIZPURUA, J. M.;JUARISTI, M.;LECEA, B.;PALOMO, P., TETRAHEDRON, 1985, 41, N 14, 2903-2911
作者:AIZPURUA, J. M.、JUARISTI, M.、LECEA, B.、PALOMO, P.
DOI:——
日期:——
Reagents and synthetic methods—40
作者:J.M. Aizpurua、M. Juaristi、B. Lecea、C. Palomo
DOI:10.1016/s0040-4020(01)96614-1
日期:1985.1
efficient for the oxidation of alcohols to carbonyl compounds, for the oxidative coupling of mercaptans into disulfides and for a mild cleavage of oximes to carbonyl compounds. Chlorotrimethylsilane-chromium trioxide has been shown to be an efficient oxidizing agent for the conversion of arylmethanes to benzaldehydes. The reagent is applied to the oxidative cleavage of some benzyl esters. A mild procedure
The Thiolate-Catalyzed Intermolecular Crossed Tishchenko Reaction: Highly Chemoselective Coupling of Two Different Aromatic Aldehydes
作者:Simon P. Curran、Stephen J. Connon
DOI:10.1002/anie.201206343
日期:2012.10.22
Crossed products: Ortho‐substituted benzaldehydes react with other aromaticaldehydes in a highly selective, atom‐economical Tishchenko disproportionation (see scheme) in the presence of a readily prepared, inexpensive thiolate‐based catalyst. The methodology is of exceptionally wide scope and exhibits a high functional‐group tolerance.