Development of a Gold-Multifaceted Catalysis Approach to the Synthesis of Highly Substituted Pyrroles: Mechanistic Insights via Huisgen Cycloaddition Studies
作者:Simbarashe Ngwerume、William Lewis、Jason E. Camp
DOI:10.1021/jo302349k
日期:2013.2.1
application of the Huisgen cycloaddition click reaction, which was used to probe the relative stability of substituted O-vinyloximes. The intermediacy of N-alkenylhydroxylamine O-vinyl ethers and imino ketones or imino aldehydes along the reaction pathway were determined by high-temperature 1H, 2H1H}, and 13C1H} NMR experiments. X-ray crystallographic evidence was used to further support the mechanistic hypothesis
通过独立地优化工艺的两个关键步骤,开发了一种直接从肟和炔烃区域选择性合成高度取代的吡咯的金催化新方法。重要的是,阳离子金(I)物种显示出沿反应路径激活多个步骤,因此可作为多面催化剂。最初由金促进的肟氧向活化的炔烃的添加原位提供了O-乙烯基肟。该Ø随后通过金催化的互变异构,[3,3]-σ重排和环脱水过程将-乙烯基肟转化为吡咯。值得注意的是,该方法提供了酯在3/4位的形式的官能团手柄,以便进一步开发。拟议的机理途径得到了Huisgen环加成点击反应的新应用的支持,该反应被用于探测取代的O-乙烯基肟的相对稳定性。的中间性Ñ -alkenylhydroxylamine ø -乙烯基醚和沿反应途径亚氨基酮或亚氨基醛是由高温测定1 H,2 H ^ 1个H},和13 C 11 H NMR实验。X射线晶体学证据被用来进一步支持机理假说。
Gold-catalysed rearrangement of O-vinyl oximes for the synthesis of highly substituted pyrroles
作者:Simbarashe Ngwerume、Jason E. Camp
DOI:10.1039/c0cc04372a
日期:——
O-Vinyl oximes were synthesised from the reaction of oximes with activated alkynes and subsequently rearranged using gold catalysis to afford highly substituted pyrroles in an efficient and regiocontrolled process. Additionally, pyrroles were formed directly from oximes and activated alkynes in a multifaceted catalysis process.
The synthesis of polyfunctionalizedpyrroles by reaction of a ketoxime with dimethyl acetylenedicarboxylate using europium(III) triflate as the catalyst is described.
Ruthenium‐Catalyzed Decarboxylative Rearrangement of 4‐Alkenyl‐isoxazol‐5‐ones to Pyrrole Derivatives
作者:Letizia Molteni、Camilla Loro、Michael S. Christodoulou、Marta Papis、Francesca Foschi、Egle M. Beccalli、Gianluigi Broggini
DOI:10.1002/ejoc.202200496
日期:2022.7.7
Easily accessible isoxazol-5(4H)-ones are useful precursors of different heterocycles. In this work, the ruthenium-catalyzed transformation of 4-alkenyl-substituted isoxazol-5-ones to 1H-pyrrole derivatives is reported.
容易获得的异恶唑-5(4 H )-酮是不同杂环的有用前体。在这项工作中,报道了钌催化的 4-烯基取代的异恶唑-5-酮向 1 H-吡咯衍生物的转化。
Law, Kam Wah; Lai, Ting-Fong; Sammes, Michael P., Journal of the Chemical Society. Perkin transactions I, 1984, p. 111 - 118
作者:Law, Kam Wah、Lai, Ting-Fong、Sammes, Michael P.、Katritzky, Alan R.、Mak, Thomas C.W.