Cu-Catalyzed Oxidative Amidation of Propiolic Acids Under Air via Decarboxylative Coupling
作者:Wei Jia、Ning Jiao
DOI:10.1021/ol1004615
日期:2010.5.7
A Cu-catalyzed aerobic oxidative amidation of propiolicacids via decarboxylation under air has been developed. Only carbon dioxide is produced as byproduct in this approach. The use of air as oxidant makes this method more useful and easy to handle.
The [2+2] cycloaddition of ynamides with the highly polarized reagent Tf2C=CH2 has been developed to regioselectively afford bis(triflyl)aminocyclobutenes in the absence of catalyst under mild conditions. Incidentally, with the ynamides bearing electron‐rich aromatic rings at the C‐terminal, an interesting reactivity switch was observed; a cyclization/hydroxylation sequence yielded 2‐amino‐3‐(trif
酰胺与高极化试剂Tf 2 C = CH 2的[2 + 2]环加成已开发出在温和条件下在不存在催化剂的情况下区域选择性地提供双(三氟乙)氨基环丁烯的方法。顺便说一下,对于在C端带有富电子芳族环的炔基,观察到一个有趣的反应性开关。一个环化/羟基化序列产生2-氨基-3-(triflyl)环丁-2-烯醇。加有醇的氨基环丁烯结构导致通过环化/加氢烷氧基化过程形成氨基环丁烯基醚。此外,通过4个π电子环的制备α-氨基-β,γ-不饱和酮和3-(三氟乙烯)丁a-1,3-二烯-2-胺,证明了官能化的氨基环丁烯作为进一步精细加工的前体的效用。开环。
Palladium-catalyzed hydroacyloxylation of ynamides
作者:Donna L. Smith、William R. F. Goundry、Hon Wai Lam
DOI:10.1039/c1cc13595c
日期:——
In the presence of substoichiometric Pd(OAc)2, carboxylic acids undergo highly regio- and stereoselective additions to ynamides to provide α-acyloxyenamides.
Atom-economic and stereoselective catalytic synthesis of fully substituted enol esters/carbonates of amides in acyclic systems enabled by boron Lewis acid catalysis
strategy for enol ester synthesis. However, the reported examples come with limitations, including the utilization of noble metal catalysts, the control of regio- and Z/E selectivity, and an application in the synthesis of enol carbonates. Herein, a boron Lewis acid-catalyzed intermolecular carboacyloxylation of ynamides with esters to access fully substituted acyclic enol esters in high yield with
Copper-catalyzed room-temperature cross-dehydrogenative coupling of secondary amides with terminal alkynes: a chemoselective synthesis of ynamides
作者:Shuang-Yan Zhuo、Jian-Liang Ye、Xiao Zheng
DOI:10.1039/d3ob02032k
日期:——
A copper-catalyzed aerobicoxidativecross-dehydrogenativecoupling reaction between secondary amides and terminal alkynes has been developed. With the aid of ligands and 3 Å molecular sieves, ynamides can be efficiently synthesized at room temperature and conveniently scaled up. A legitimate mechanism involving nitrogen-centred radicals and copper trivalent intermediates has been proposed.
已经开发出仲酰胺和末端炔之间的铜催化的有氧氧化交叉脱氢偶联反应。借助配体和 3 Å 分子筛,可以在室温下高效合成 ynamides,并方便地放大生产。已经提出了涉及以氮为中心的自由基和三价铜中间体的合法机制。