A Traceless Heterocyclic Amine Mediator in Regioselectivity−Switchable Formal [1 + 2 + 2] Cycloaddition Reaction to 1,3,4- and 1,4,5-Trisubstituted Pyrazoles
作者:Jie Huo、Xiao Geng、Wanmei Li、Pengfei Zhang、Lei Wang
DOI:10.1021/acs.orglett.2c04227
日期:2023.1.27
diversity and complexity by slightly changing the reaction conditions. Described herein is a regioselectivity-switchable formal [1 + 2 + 2] cycloaddition reaction from difluoroalkyl compounds, enaminones, and RNHNH2, ultimately using 1-methylindazol-3-amine as a traceless mediator to switch the inherent regioselectivity of 1,3,4-trisubstituted pyrazole formation to 1,4,5-trisubstituted pyrazoles. Remarkable
Radical-Polar Crossover Enabled Triple Cleavage of CF<sub>2</sub>Br<sub>2</sub>: A Multicomponent Tandem Cyclization to 3-Fluoropyrazoles
作者:Wanqing Zuo、Lingling Zuo、Xiao Geng、Zhifang Li、Lei Wang
DOI:10.1021/acs.orglett.3c02305
日期:2023.8.18
cyclization to polysubstituted fluoropyrazoles by using CF2Br2 as a novel C1F1 synthon. Mechanistic experiments revealed that the in situ generation of the reactive intermediate gem-difluorovinylimine ion is the key to this transformation. This protocol unlocks the novel reactivity of CF2Br2 and adds significant synthetic values to fluorine chemistry.
catalytic system has been established for the synthesis of highly functional indolizines throughoxidative [3 + 2] cycloaddition of enamines and pyridotriazoles. This modular platform is compatible with a broad range of functional groups, including natural and complex skeletons, allowing for late-stage modifications. It features a step-economical, highly regioselective, and easy-handling procedure and has been
Switchable Multicomponent Cyclization Reactions to Access Fluoroalkylated Dihydropyrimidines and Pyrimidines under Solvent‐Free Conditions
作者:Wanqing Zuo、Zhizhen Zhu、Yu Cheng、Lingling Zuo、Xiao Geng、Zhifang Li、Lei Wang
DOI:10.1002/cjoc.202300725
日期:2024.6.15
The development of switchable solvent-free multicomponent reactions to build high-value-added products is an important demand for organic synthesis. Herein, we detailed the successful implementation of a switchable strategy for the construction of diverse 4-fluoroalkyl-1,4-dihydropyrimidines and 4-fluoroalkyl-pyrimidines via a solvent/additive-free [3 + 2 + 1] annulation, starting from readily available
Visible‐Light‐Induced Domino Cyclization to Access Pyrido[2,3‐d]pyrimidine‐2,4‐diones via a Radical‐Polar Crossover Reaction
作者:Wanqing Zuo、Yu Cheng、Zhizhen Zhu、Lingling Zuo、Xiao Geng、Zhifang Li、Lei Wang
DOI:10.1002/cjoc.202400315
日期:2024.10
and green strategies for the synthesis of privileged scaffolds are synthetically appealing. We now report a radical-polarcrossover (RPC)-enabled three-component cyclization of bromodifluoroalkyls with enaminones and 6-aminouraciles via a visible-light-induced domino cyclization. The reaction exhibited a broad substrate scope (> 40 examples) including complex molecules, which highlighted the utility