Fluorinated 4H-1,3-diazepines by reaction of difluorocarbene with 2H-azirines
摘要:
5,7-Diaryl-2-fluoro-4H-1,3-diazepines have been synthesized from 3-aryl-substituted 2H-azirines and diffilorocarbene. The reaction involves isomerization of azirinium ylide into a 2-aza-1.3-diene which undergoes [4+2]-cycloaddition with the starting azirine followed by ring expansion and dehydrofluorination. (c) 2005 Elsevier Ltd. All rights reserved.
One-Pot Three-Component Synthesis of Enamine-Functionalized 1,2,3-Triazoles via Cu-Catalytic Azide–Alkyne Click (CuAAC) and Cu-Catalyzed Vinyl Nitrene Transfer Sequence
作者:Wei Zhou、Min Zhang、Hanhui Li、Wanzhi Chen
DOI:10.1021/acs.orglett.6b02850
日期:2017.1.6
derivatives have been prepared via the Cu-catalyzed three-component reaction of terminal alkyne, azide, and 2H-azirine. The reaction proceeds through insertion of vinyl nitrene into the C–Cu bond of the triazolyl-Cu species, providing an efficient and step- and atom-economic approach to the enamine-bearing polysubstituted 1,2,3-triazoles. The resulting triazoles were easily transformed to trisubstituted
Self-Catalyzed Rapid Synthesis of <i>N</i>-Acylated/<i>N</i>-Formylated α-Aminoketones and <i>N</i>-Hydroxymethylated Formamides from 3-Aryl-2<i>H</i>-Azirines and 2-Me/Ph-3-Aryl-2<i>H</i>-Azirines
作者:Aramita De、Sougata Santra、Grigory V. Zyryanov、Adinath Majee
DOI:10.1021/acs.orglett.0c01206
日期:2020.5.15
by the reaction of 3-aryl-2H-azirines and highly substituted 2-Me/Ph-3-aryl-2H-azirines with various carboxylic acids under ambient air within 10 min at room temperature. N-Trifluoroacetylated α-aminoketones with different substituents have been reported in the presence of trifluoroacetic acid. This protocol is equally effective to synthesize N-formylated α-aminoketone and N-hydroxymethylated formamide
Copper-Catalyzed Sulfonyl Azide–Alkyne Cycloaddition Reactions: Simultaneous Generation and Trapping of Copper–Triazoles and −Ketenimines for the Synthesis of Triazolopyrimidines
作者:Madhu Nallagangula、Kayambu Namitharan
DOI:10.1021/acs.orglett.7b01500
日期:2017.7.7
First simultaneous generation and utilization of both copper–triazole and −ketenimine intermediates in copper-catalyzed sulfonyl azide–alkyne cycloaddition reactions is achieved for the one-pot synthesis of triazolopyrimidines via a novel copper-catalyzed multicomponent cascade of sulfonyl azides, alkynes, and azirines. Significantly, the reaction proceeds under very mild conditions in good yields
A sustainable strategy for the straightforward preparation of 2<i>H</i>-azirines and highly functionalized <i>NH</i>-aziridines from vinyl azides using a single solvent flow-batch approach
The reported flow-batch approach enables the easy preparation of 2H-azirines and their stereoselective transformation into highly functionalized NH-aziridines, starting from vinylazides and organolithium compounds. The protocol has been developed using cyclopentyl methyl ether (CPME) as an environmentally benign solvent, resulting into a sustainable, safe and potentially automatable method for the