Catalytic Enantioselective Synthesis of Bicyclic Lactam <i>N</i>
,<i>S</i>
-Acetals in One Pot by Cascade Transformations
作者:Kaiheng Zhang、Luca Deiana、Erik Svensson Grape、A. Ken Inge、Armando Córdova
DOI:10.1002/ejoc.201900923
日期:2019.8.7
A versatile strategy for the enantioselective synthesis of bicycliclactam N,S-acetals by one-pot cascade transformations is disclosed. The transformation of readily available substrates is promote ...
Thermoregulated phase-transfer iridium nanoparticle catalyst: highly selective hydrogenation of the CO bond for α,β-unsaturated aldehydes and the CC bond for α,β-unsaturated ketones
作者:Wenjiang Li、Yanhua Wang、Pu Chen、Min Zeng、Jingyang Jiang、Zilin Jin
DOI:10.1039/c6cy01137c
日期:——
thermoregulated ligand Ph2P(CH2CH2O)22CH3-stabilized iridium nanoparticles exhibited a totally different orientation for the hydrogenation of unsaturated carbonyl compounds, namely, highly selective hydrogenation of the CO bond for α,β-unsaturated aldehydes and the CC bond for α,β-unsaturatedketones.
Direct construction of carbazoles from 2-methyl-indole-3-carbaldehydes and enals
作者:Dehai Liu、Jie Huang、Zhenqian Fu、Wei Huang
DOI:10.1039/c9gc00064j
日期:——
The direct and rapid construction of carbazoles was achieved via the reaction of 2-methyl-indole-3-carbaldehydes with enals promoted by LiCl/DBU in a single operation. This mild and green reaction proceeds through a [4 + 2] cycloaddition/dehydration/oxidative aromatization cascade to generate carbazoles in good to excellent yields. The reaction features mild reaction conditions, a broad substrate scope
obtained by the reaction of 1-phenylthio-2,3-epoxypropane (1) with sodium hydride in tetrahydrofuran (THF) and successive treatment with methyl iodide, was lithiated with lithium diisopropylamide at −78°C. The lithio derivative reacted with alkylhalides regioselectively at the α-position of sulfur atom, and hydrolysis of the products at room temperature in the presence of mercuric chloride afforded the
Catalytic Intermolecular Cross-Couplings of Azides and LUMO-Activated Unsaturated Acyl Azoliums
作者:Wenjun Li、Manjaly J. Ajitha、Ming Lang、Kuo-Wei Huang、Jian Wang
DOI:10.1021/acscatal.6b03674
日期:2017.3.3
An example for the catalytic synthesis of densely functionalized 1,2,3-triazoles through a LUMO activation mode has been developed. The protocol is enabled by intermolecular cross-coupling reactions of azides with in situ-generated α,β-unsaturated acyl azoliums. High yields and broad scope as well as the investigation of reaction mechanism are reported.