Results 201 to 210 of about 28,644 (231)
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Organic Letters, 2021
An enantioselective dearomative 1,3-dipolar cycloaddition of 2-nitrobenzothiophenes and isatin-derived azomethine ylides with a bifunctional hydrogen-bonding thiourea catalyst was established, giving polyheterocyclic compounds in excellent results (up to
Jian‐Qiang Zhao +7 more
semanticscholar +1 more source
An enantioselective dearomative 1,3-dipolar cycloaddition of 2-nitrobenzothiophenes and isatin-derived azomethine ylides with a bifunctional hydrogen-bonding thiourea catalyst was established, giving polyheterocyclic compounds in excellent results (up to
Jian‐Qiang Zhao +7 more
semanticscholar +1 more source
Organic Letters, 2021
An unprecedented iridium-catalyzed asymmetric [4 + 3] cycloaddition of racemic 4-indolyl allylic alcohols with azomethine ylides is reported. The ability of acid promoter zinc triflate to perform multiple roles is the key factor for the success of this ...
Wulin Yang, Tao Ni, W. Deng
semanticscholar +1 more source
An unprecedented iridium-catalyzed asymmetric [4 + 3] cycloaddition of racemic 4-indolyl allylic alcohols with azomethine ylides is reported. The ability of acid promoter zinc triflate to perform multiple roles is the key factor for the success of this ...
Wulin Yang, Tao Ni, W. Deng
semanticscholar +1 more source
Journal of Organic Chemistry, 2021
A silver-mediated [3 + 2] cycloaddition of azomethine ylides with trifluoroacetimidoyl chlorides for the rapid assembly of 5-(trifluoromethyl)imidazoles has been developed.
Hefei Yang +3 more
semanticscholar +1 more source
A silver-mediated [3 + 2] cycloaddition of azomethine ylides with trifluoroacetimidoyl chlorides for the rapid assembly of 5-(trifluoromethyl)imidazoles has been developed.
Hefei Yang +3 more
semanticscholar +1 more source
Synthesis, 2021
A diastereoselective synthesis of biologically interesting spirobarbiturates has been achieved via [3+2] cycloaddition of alloxan-derived azomethine ylides to 3-R-1,2-diphenylcyclopropenes. With this approach, a range of spirobarbiturate-3-azabicyclo[3.1.
A. Filatov +5 more
semanticscholar +1 more source
A diastereoselective synthesis of biologically interesting spirobarbiturates has been achieved via [3+2] cycloaddition of alloxan-derived azomethine ylides to 3-R-1,2-diphenylcyclopropenes. With this approach, a range of spirobarbiturate-3-azabicyclo[3.1.
A. Filatov +5 more
semanticscholar +1 more source
Journal of Organic Chemistry, 2021
The carbenoid-type (cb-type) 32CA reaction of 1,1-difluoroated azomethine ylide (DFAY) with phenylpropynal has been studied using the molecular electron density theory (MEDT). Electron localization function (ELF) characterizes DFAY as a carbenoid species
L. Domingo +3 more
semanticscholar +1 more source
The carbenoid-type (cb-type) 32CA reaction of 1,1-difluoroated azomethine ylide (DFAY) with phenylpropynal has been studied using the molecular electron density theory (MEDT). Electron localization function (ELF) characterizes DFAY as a carbenoid species
L. Domingo +3 more
semanticscholar +1 more source
Catalytic Asymmetric Reactions with N-Metallated Azomethine Ylides.
Accounts of Chemical Research, 2020ConspectusOptically active nitrogen-containing compounds have attracted substantial attention due to their ubiquity in the cores of natural products and bioactive molecules.
Liang Wei +2 more
semanticscholar +1 more source
Synthesis, 2021
The multi-component 1,3-dipolar cycloaddition of ninhydrin, α-amino acids (or peptides), and cyclopropenes for the synthesis of spirocyclic heterocycles containing both 3-azabicyclo[3.1.0]hexane and 2H-indene-1,3-dione motifs has been developed.
Siqi Wang +8 more
semanticscholar +1 more source
The multi-component 1,3-dipolar cycloaddition of ninhydrin, α-amino acids (or peptides), and cyclopropenes for the synthesis of spirocyclic heterocycles containing both 3-azabicyclo[3.1.0]hexane and 2H-indene-1,3-dione motifs has been developed.
Siqi Wang +8 more
semanticscholar +1 more source
Synthesis, 2021
4-Pyrones bearing electron-donating and electron-withdrawing groups react with nonstabilized azomethine ylides to form pyrano[2,3-c]pyrrolidines in moderate to good yields.
D. L. Obydennov +5 more
semanticscholar +1 more source
4-Pyrones bearing electron-donating and electron-withdrawing groups react with nonstabilized azomethine ylides to form pyrano[2,3-c]pyrrolidines in moderate to good yields.
D. L. Obydennov +5 more
semanticscholar +1 more source
Organic Letters, 2020
A Brønsted base and Lewis acid cooperatively catalyzed 1,3-dipolar cycloaddition is reported through chiral dinuclear zinc catalysts. An asymmetric exo'-selective [3 + 2] cycloaddition of CF3-containing N-unprotected isatin-derived azomethine ylides is ...
Yang Yi +4 more
semanticscholar +1 more source
A Brønsted base and Lewis acid cooperatively catalyzed 1,3-dipolar cycloaddition is reported through chiral dinuclear zinc catalysts. An asymmetric exo'-selective [3 + 2] cycloaddition of CF3-containing N-unprotected isatin-derived azomethine ylides is ...
Yang Yi +4 more
semanticscholar +1 more source
Organic Letters, 2020
Here we report the 1,3-dipolar cycloaddition of polycyclic aromatic azomethine ylides with nitriles to produce highly fused imidazole derivatives, that is, tribenzo[b,g,ij]imidazo[2,1,5-de]quinolizine.
Qiang-Qiang Li +3 more
semanticscholar +1 more source
Here we report the 1,3-dipolar cycloaddition of polycyclic aromatic azomethine ylides with nitriles to produce highly fused imidazole derivatives, that is, tribenzo[b,g,ij]imidazo[2,1,5-de]quinolizine.
Qiang-Qiang Li +3 more
semanticscholar +1 more source