A Direct, Versatile, and Chemoselective Synthesis of Vinylogous Bis- and Monourethanes/amides and β-Keto Esters by Aza-Knoevenagel-Type Reactions of Tertiary Amides with Enolates
作者:Pei-Qiang Huang、Wei Ou
DOI:10.1002/ejoc.201601326
日期:2017.1.18
carbanions generated from methyl ketones, malonic acid monoester, 2-phenylacetate, or (benzylsulfonyl)benzene. Moreover, when higher homologous of acetate was used, beta-keto esters were obtained directly from amides. The method has been applied to the one-step synthesis of several known key intermediates in the total synthesis of alkaloids and quinoline antibiotics. An efficient and mild intramolecular Friedel-Crafts
Reduction of Amides to Amines with Pinacolborane Catalyzed by Heterogeneous Lanthanum Catalyst La(CH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>NMe<sub>2</sub>-<i>o</i>)<sub>3</sub>@SBA-15
作者:Chenjun Guo、Fangcao Zhang、Chong Yu、Yunjie Luo
DOI:10.1021/acs.inorgchem.1c01531
日期:2021.9.6
Hydroboration of amides is a useful synthetic strategy to access the corresponding amines. In this contribution, it was found that the supported lanthanum benzyl material La(CH2C6H4NMe2-o)3@SBA-15 was highly active for the hydroboration of primary, secondary, and tertiary amides to amines with pinacolborane. These reactions selectively produced target amines and showed good tolerance for functional
酰胺的硼氢化是获得相应胺的有用合成策略。在该贡献中,发现负载的镧苄基材料 La(CH 2 C 6 H 4 NMe 2 - o ) 3 @SBA-15 对伯、仲和叔酰胺与频哪醇硼烷硼氢化成胺具有高度活性。这些反应选择性地产生目标胺,并显示出对 -NO 2等官能团的良好耐受性、-卤素和-CN,以及S和O等杂原子。这种还原过程表现出多相催化剂的可回收和可重复使用的特性,适用于克级合成。反应机理是基于一些控制实验和以前的文献提出的。这是由多相催化剂介导的酰胺硼氢化还原为胺的第一个例子。
Hydroborative reduction of amides to amines mediated by La(CH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>NMe<sub>2</sub>-<i>o</i>)<sub>3</sub>
作者:Fangcao Zhang、Chenjun Guo、Mingliang Gong、Hongzhen Xie、Yunjie Luo
DOI:10.1039/d1nj04996h
日期:——
amides to amines is a great challenge for resonance-stabilized carboxamide moieties, although this synthetic strategy is an attractive approach to access the corresponding amines. La(CH2C6H4NMe2-o)3, a simple and easily accessible lanthanide complex, was found to be highly efficient not only for secondary and tertiary amide reduction, but also for the most challenging primary reduction with pinacolborane
酰胺脱氧还原为胺对于共振稳定的羧酰胺部分是一个巨大的挑战,尽管这种合成策略是获得相应胺的有吸引力的方法。La(CH 2 C 6 H 4 NMe 2 - o ) 3是一种简单易得的镧系元素络合物,被发现不仅对于仲酰胺和叔酰胺还原非常有效,而且对于频哪硼烷最具挑战性的初级还原也是如此。该方案对许多官能团和杂原子表现出良好的耐受性,可应用于克级合成。该催化循环中的活性物质可能是镧系元素氢化物。
Room-Temperature Decarboxylative Couplings of α-Oxocarboxylates with Aryl Halides by Merging Photoredox with Palladium Catalysis
作者:Wan-Min Cheng、Rui Shang、Hai-Zhu Yu、Yao Fu
DOI:10.1002/chem.201502286
日期:2015.9.14
Enabled by merging iridium photoredoxcatalysis and palladiumcatalysis, α‐oxocarboxylate salts can be decarboxylatively coupled with arylhalides to generate aromatic ketones and amides at room temperature. DFT calculations suggest that this reaction proceeds through a Pd0–PdII–PdIII pathway, in which the PdIII intermediate is responsible for reoxidizing IrII to complete the IrIII–*IrIII–IrII photoredox
通过合并铱的光氧化还原催化和钯催化,α-氧代羧酸盐可以与芳基卤化物脱羧偶联,在室温下生成芳族酮和酰胺。DFT计算表明,该反应通过Pd 0 -Pd II -Pd III途径进行,其中Pd III中间体负责重新氧化Ir II以完成Ir III- * Ir III -Ir II光氧化还原循环。
A novel N-dealkylation reaction of n,N-dialkylarylcarboxamides promoted by electron transfer from alkali metals
作者:Rafik Karaman、James L. Fry
DOI:10.1016/s0040-4039(00)94398-3
日期:1990.1
Reactions of some N,N-dialkylarylcarboxamides with either lithium or sodium metals in dry tetrahydrofuran (THF) promoted by ultrasound waves afforded the corresponding N-monoalkylarylcarboxamides in good yields. In the cases of N,N-diethylarylcarboxamides the products obtained were derived from coupling reactions rather than from N-dealkylation reactions.