Rhodium(I)‐Catalyzed Three‐Component [4+2+1] Cycloaddition of Two Vinylallenes and CO
作者:Qi Cui、Zi‐You Tian、Zhi‐Xiang Yu
DOI:10.1002/chem.202005443
日期:2021.3.26
tropone derivatives under mild conditions, where one vinylallene acts as a C4 synthon, the other vinylallene as a C2 synthon, and CO as a C1 synthon. It was proposed that this reaction occurred via oxidative cyclization of the diene part of one vinylallene molecule, followed by insertion of the terminal alkene part of the allene moiety in another vinylallene, into the Rh−C bond of five‐membered rhodacycle
Brønsted Acids Enable Three Molecular Rearrangements of One 3-Alkylidene-2<i>H</i>-1,2-oxazine Molecule into Distinct Heterocyles
作者:Bhanudas Dattatray Mokar、Jinxian Liu、Rai-Shung Liu
DOI:10.1021/acs.orglett.7b03985
日期:2018.2.16
This work describes three different strategies to structurally rearrange one 3-alkylidene-2H-1,2-oxazine molecule into three distinct heterocycles using HOTf, propiolic acid, and silicagel, respectively. The mechanisms of these rearrangement reactions involve three independent routes, including (i) Brønsted acid catalysis, (ii) a synergetic action of Brønsted acids and anions, (iii) a surface-directed
这项工作描述了三种不同的策略,分别使用HOTf,丙酸和硅胶将一个3-亚烷基-2 H -1,2-恶嗪分子结构重排成三个不同的杂环。这些重排反应的机理涉及三个独立的途径,包括(i)布朗斯台德酸催化,(ii)布朗斯台德酸和阴离子的协同作用,(iii)表面定向的化学选择性。
Palladium-catalyzed dearomative allylation of indoles with cyclopropyl acetylenes: access to indolenine derivatives
作者:Chuan-Jun Lu、Yu-Ting Chen、Hong Wang、Yu-Jin Li
DOI:10.1039/d0ob02103b
日期:——
A palladium-catalyzed redox-neutral allylic alkylation of indoles with cyclopropylacetylenes has been disclosed. Various 1,3-diene indolenine framework bearing a quaternary stereocenter at the C3 position were synthesized straightforwardly in good to excellent yields with high regio- and stereoselectivities. The reaction could be further expanded to the dearomatization of naphthols to synthesize functionalized
access a cis-poly(butadiene)-derived backbone by a ligand swap on copper hydride species. Interestingly, borocupration, typically exhibiting identical regioselectivity with its hydro- and silyl analogues, seems to proceed in a 3,4-selective manner. Computational studies suggest the possible role of the propargylic leaving group in this selectivity switch. This work presents a new class of regioregular
Controllable Pd-Catalyzed Allylation of Indoles with Skipped Enynes: Divergent Synthesis of Indolenines and <i>N</i>-Allylindoles
作者:Xinxin Fang、Qiuyu Li、Rui Shi、Hequan Yao、Aijun Lin
DOI:10.1021/acs.orglett.8b02481
日期:2018.10.5
An unprecedented acid- and ligand-controlled divergent allylation of indoles with unactivated skipped enynes via Pd hydride catalysis has been disclosed. This redox-neutral transformation went through multiple hydropalladation insertion, beta-hydrogen elimination, pi-sigma-pi isomerization, and allylic substitution steps. This method not only provides a platform for synthesizing indolenines and N-allylindoles but also allows facile access to functional 1,3-dienes with high atom and step economy.