Synthesis of enaminones containing diverse N,N-disubstitution via simple transamination: a study with sustainable catalyst-free operation
作者:Yong Gao、Yunyun Liu、Li Wei、Jieping Wan
DOI:10.1007/s11164-017-2946-z
日期:2017.10
Abstract A systematic investigation on the synthesis of β-enaminones containing diverse N,N-disubstitution via the transamination of N,N-dimethyl amino functionalized β-enaminones and secondary amines has been conducted by employing biomass available green solvent ethyl lactate as reaction medium. A class of β-enaminones containing different N,N-disubstitutions have been smoothly synthesized under
An unprecedented approach toward the general synthesis of α-keto amides has been established by tailoring the CC double bond of enaminones in the presence of CuI and hypervalent iodine.
已通过在CuI和高价碘存在下调整烯胺酮的C=C双键,建立了合成α-酮酰胺的前所未有方法。
Synthesis of α-Keto Thioamides by Metal-Free C═C Bond Cleavage in Enaminones Using Elemental Sulfur
作者:Lu Gan、Yong Gao、Li Wei、Jie-Ping Wan
DOI:10.1021/acs.joc.8b02670
日期:2019.1.18
cleaving the C═C bond in N,N-disubstituted enaminones in the presence of elemental sulfur and N,N-dimethyl-4-aminopyridine is disclosed. Without using any metal catalyst or additive, the cascade functionalization of both C═C and C–H bonds takes place to enable the formation of new C═S and C–N bonds, thus providing a facile and practical method for the synthesis of N,N-disubstituted α-keto thioamides.
Ultrasound-Promoted Synthesis of α-Thiocyanoketones via Enaminone C═C Bond Cleavage and Tunable One-Pot Access to 4-Aryl-2-aminothiazoles
作者:Yunyun Liu、Tao Zhang、Jie-Ping Wan
DOI:10.1021/acs.joc.2c00708
日期:2022.6.17
to promote the thiocyanation of the C═Cbond in enaminones for the synthesis of α-thiocyanoketones and 2-aminothiazoles. The reactions of enaminones with ammonium thiocyanate provide α-thiocyanoketones with ultrasound irradiation at room temperature. More interestingly, simply further heating the vessel after ultrasonic irradiation leads to the selective synthesis of 2-aminothiazoles with an unconventional
Copper‐Catalyzed Olefinic C(<i>sp</i><sup>2</sup>)−H Activation/Carbene Insertion/Ester Hydrolysis/Cyclization with Aryl Diazo Esters for the Synthesis of Multisubstituted Furanones
作者:Yuzhi Wang、Yadong Yu、Yang Yu、Fei Huang、Jonathan B. Baell
DOI:10.1002/adsc.202300494
日期:2023.8.10
A copper-catalyzed olefinic C(sp2)−H activation/carbene insertion/ester hydrolysis/cyclization sequence has been developed for the synthesis of substituted 2(5H)-furanones employing readily available enaminones and aryl diazo esters as substrates. This method features operationally simple and good functional group tolerance. The transformation could be scaled up to gram quantities and the obtained
开发了铜催化烯属 C( sp 2 )−H 活化/卡宾插入/酯水解/环化序列,用于使用容易获得的烯胺酮和芳基重氮酯作为底物合成取代的 2(5 H )-呋喃酮。该方法操作简单,官能团耐受性好。该转化可以扩大到克量,并且所获得的 2(5 H )-呋喃酮衍生物可以很容易地转化为各种有用的合成结构单元,表明该合成策略的适用性。同位素标记实验表明重氮酯的酯基在反应过程中被水解。