Gold-Catalyzed Cycloaddition Reactions of Ethyl Diazoacetate, Nitrosoarenes, and Vinyldiazo Carbonyl Compounds: Synthesis of Isoxazolidine and Benzo[<i>b</i>]azepine Derivatives
作者:Vinayak Vishnu Pagar、Rai-Shung Liu
DOI:10.1002/anie.201500340
日期:2015.4.13
Gold‐catalyzed cycloadditions of ethyldiazoacetate, nitrosoarenes, and vinyldiazo carbonyl species to yield isoxazolidine derivatives stereoselectively are described. Treatment of these isoxazolidine products with the same catalyst results in a novel 1,2‐H shift/[3,3] rearrangement to give benzo[b]azepine compounds. The mechanism of this skeletal rearrangement is elucidated with deuterium‐labeling
Vinyldiazo Compounds as 3-Carbon Radical Acceptors: Synthesis of 4-Fluoroacridines via Visible-Light-Promoted Cascade Radical Cyclization
作者:Weiyu Li、Lei Zhou
DOI:10.1021/acs.orglett.1c01204
日期:2021.6.4
developed as the radical acceptors in a visible-light-promoted sequential radical cyclization reaction, providing a mechanistically distinct pathway to achieve (3 + 3) cyclization. Using N-aryl chlorodifluoromethyl alkynyl ketoimines as the radical precursors, the reaction allows the introduction of a fluorine atom to the acridine skeleton during the construction of both the pyridine and benzene motifs from
Gold-Catalyzed Reactions between Alkenyldiazo Carbonyl Species and Acetals
作者:Vinayak Vishnu Pagar、Appaso M. Jadhav、Rai-Shung Liu
DOI:10.1021/jo400419d
日期:2013.6.7
In the presence of catalyst IPrAuSbF6 catalyst (IPr = 1,3-bis(diisopropylphenyl)imidazol-2-ylidene), alkenyldiazo carbonyl species react with organic acetals to give E-configured alkyl 3,5-dimethoxy-5-pent-2-enoates stereoselectively. This reaction sequence comprises an initial Prins-type reaction, followed by gold carbene formation.