Stereospecific [3+2] Cycloaddition of Chiral Arylallenes with C,N-Cyclic Azomethine Imines.

Org Lett

KAUST Catalysis Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.

Published: May 2023

A novel α,β-regioselective [3+2] cycloaddition reaction of arylallene with C,N-cyclic azomethine imine is reported. The axial-to-central chirality transfer phenomenon has been disclosed with chiral allenes in the reaction. The wide substrate scope, including different functional groups and natural products, reveals the generality of the methodology. Both experiments and density functional theory calculations have been used to elucidate a plausible mechanism.

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.orglett.3c00984DOI Listing

Publication Analysis

Top Keywords

[3+2] cycloaddition
8
cn-cyclic azomethine
8
stereospecific [3+2]
4
cycloaddition chiral
4
chiral arylallenes
4
arylallenes cn-cyclic
4
azomethine imines
4
imines novel
4
novel αβ-regioselective
4
αβ-regioselective [3+2]
4

Similar Publications

1,1-Difluoroallenes underwent regioselective [2 + 2] and [3 + 2] cycloadditions with aldehydes using Au(I) catalysts. An AuCl catalyst enabled an α,β-selective [2 + 2] cycloaddition of 1,1-difluoroallenes, yielding ()-3-alkylidene-2,2-difluorooxetanes. Conversely, an AuCl(IPr)-AgSbF catalyst facilitated an α,γ-selective [3 + 2] cycloaddition, followed by dehydrofluorination to produce aromatized 2-fluorofurans.

View Article and Find Full Text PDF

The carbon dioxide (CO) capture and utilization strategy has emerged as an innovative and multifaceted approach to counteract carbon emissions. In this study, a highly porous muffin polyhedral barium (Ba) ̵ organic framework (BaTATB; HTATB = 4,4',4″--triazine-2,4,6-triyl-tribenzoic acid) was synthesized solvothermally. The three-dimensional honeycomb pore architectures were densely populated with Lewis acidic Ba(II) metal sites and basic nitrogen-rich triazines.

View Article and Find Full Text PDF

Matrix effects pose a significant challenge in food analysis for the quantitative analysis of complex food samples. Herein, a novel magnetic covalent organic framework nanocomposite and the copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) click reaction-based stable isotope labeling (SIL) method were presented for highly selective and sensitive detection of steroid hormones in food samples using HPLC-MS/MS. The nanocomposite, FeO@TAPB-COF, with a core-shell structure exhibited high adsorption capacities for steroid hormones.

View Article and Find Full Text PDF

Palladium-Catalyzed Tandem Reactions via Allene Intermediates for the Rapid Synthesis of a Fused Indenone-Indole Scaffold.

Org Lett

January 2025

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China.

A palladium-catalyzed tandem reaction of 1-(2-iodophenyl)-3-arylprop-2-yn-1-ones and 1-(2-azidophenyl)propargyl ethers is developed to provide the rapid construction of a fused polycyclic indenone-indole scaffold under mild conditions. The reaction proceeds via a highly ordered process involving Sonogashira coupling, propargyl-allenyl isomerization, allene-azide cycloaddition, denitrogenation, and diradical coupling. The proposed reaction mechanism is supported by experimental and computational studies.

View Article and Find Full Text PDF

Synthesis of Nonplanar Push-Pull Chromophores with Various Heterocyclic Moieties via [2 + 2] Cycloaddition-Retroelectrocyclization Reaction.

J Org Chem

January 2025

Department of Materials Science and Engineering, Institute of Science Tokyo, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan.

A series of 1,1,4,4-tetracyanobuta-1,3-diene (TCBD) derivatives with various heterocyclic moieties, including pyridine, carbazole, indole, and benzothiadiazole, was newly synthesized through a [2 + 2] cycloaddition-retroelectrocyclization reaction. Symmetric electron-rich 1,3-butadiynes with end-capped heterocyclic substituents were reacted with tetracyanoethylene (TCNE), yielding the target TCBD products in 60-80% yields under ambient or mild heating conditions. The thermal stability and optical and electrochemical properties of both 1,3-butadiyne precursors and the corresponding TCBD derivatives were investigated by using thermogravimetric analysis (TGA), UV-vis spectroscopy, and cyclic voltammetry (CV).

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!