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chemistry, organic (70) 70
chemistry, multidisciplinary (53) 53
cycloaddition (43) 43
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oxyallyl cations (33) 33
cations (26) 26
ketones (23) 23
oxyallyl (23) 23
chemistry (19) 19
oxyallyl intermediate (18) 18
stabilized oxyallyl cations (17) 17
catalysis (16) 16
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allyl cations (14) 14
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1,3-dienes (12) 12
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derivatives (12) 12
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cyclopropanones (7) 7
intramolecular 4+3 cycloadditions (7) 7
oxidation (7) 7
reaction mechanisms (7) 7
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allenes (6) 6
aza-oxyallyl cations (6) 6
cycloadditions (6) 6
cyclopropanone (6) 6
density functional calculations (6) 6
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furans (6) 6
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oxyallyl derivatives (6) 6
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4+3 cycloaddition reactions (5) 5
catalysts (5) 5
chemical reactions (5) 5
cyclopentenones (5) 5
cyclopentyl oxyallyl (5) 5
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kation (5) 5
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physics, atomic, molecular & chemical (5) 5
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ethers (4) 4
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Chemical Communications, ISSN 1359-7345, 5/2018, Volume 54, Issue 41, pp. 5154 - 5163
Heterocyclic compounds are widely found in many natural isolates and medicinally relevant compounds, as well as some fine chemicals. The development of general... 
ACTIVATED ALKENES | ANNULATION | CATALYZED CYCLOADDITION | 1,4-DIAMINATION | AZA-OXYALLYL CATIONS | CARBON-DISULFIDE | AZIRIDINES | N-SUBSTITUTED OXINDOL | CHEMISTRY, MULTIDISCIPLINARY | 3+2 CYCLOADDITION | ACCESS
Journal Article
Chemical Communications : Chem Comm, ISSN 1359-7345, 01/2018, Volume 54, Issue 41, pp. 5154 - 5163
Heterocyclic compounds are widely found in many natural isolates and medicinally relevant compounds, as well as some fine chemicals. The development of general... 
Organic chemistry | Cycloaddition | Heterocyclic compounds | Fine chemicals | Construction methods | Cations | Reaction mechanisms | Chemical synthesis
Journal Article
Organic Letters, ISSN 1523-7060, 02/2007, Volume 9, Issue 4, pp. 703 - 706
Cross-conjugated dienones with pendent azide side chains undergo interrupted Nazarov trapping, leading to peroxy-bridged indolizidinones in good yields. This... 
ORGANIC-SYNTHESIS | TRIPLET OXYGEN | DIENES | CYCLOADDITIONS | CHEMISTRY, ORGANIC | SYSTEMS | OXYALLYL INTERMEDIATE | CYCLIZATION | Betaine - chemistry | Aerobiosis | Oxidation-Reduction | Mass Spectrometry | Indolizines - chemical synthesis | Catalysis | Azides - chemistry | Bridged-Ring Compounds - chemical synthesis | Hydrogenation
Journal Article
Journal of the American Chemical Society, ISSN 0002-7863, 02/2010, Volume 132, Issue 7, pp. 2108 - 2109
The interaction of a sulfamate ester derived metallonitrene with an allene generates a versatile intermediate with 2-amidoallylcation-like reactivity, capable... 
OXIDATIVE CYCLIZATIONS | ACIDS | RING | OXYALLYL CATIONS | INTRAMOLECULAR 4+3 CYCLOADDITIONS | DERIVATIVES | PRECURSORS | CHEMISTRY, MULTIDISCIPLINARY | ALLENAMIDES | EPOXIDATION | Rhodium | Analysis | Cyclopropane compounds | Organometallic compounds | Substitution reactions | Catalysis | Chemical properties | Structure
Journal Article
Chemical Communications, ISSN 1359-7345, 02/2016, Volume 52, Issue 11, pp. 2300 - 2303
Herein we describe a new method, enabling the synthesis of highly functionalized 1,4-diketones that are readily differentiated as monosilylenol ethers under... 
CYCLOADDITION REACTIONS | ETHERS | NAZAROV CYCLIZATION | OXYALLYL CATIONS | CHEMISTRY, MULTIDISCIPLINARY | GRIGNARD-REAGENTS | ACYL CYANOHYDRINS | INDOLES | DINOFLAGELLATE AMPHIDINIUM SP | PAAL-KNORR SYNTHESIS
Journal Article
Tetrahedron Letters, ISSN 0040-4039, 2007, Volume 48, Issue 29, pp. 5091 - 5094
Simple cross-conjugated dienones undergo Nazarov cyclization and in situ trapping in the presence of vinyl sulfides, yielding functionalized... 
CHEMISTRY, ORGANIC | CYCLOISOMERIZATION | SYSTEMS | BRIDGED BICYCLIC DIENONES | OXYALLYL INTERMEDIATE | CYCLIZATION
Journal Article
Tetrahedron Letters, ISSN 0040-4039, 2005, Volume 46, Issue 34, pp. 5629 - 5632
Upon treatment with TiCl 4, various bridged bicyclic dienones underwent Nazarov electrocyclization and efficient chloride trapping of the resulting... 
Lewis acid | Carbocation | Diastereoselective | Halide | Nazarov cyclization | DEHALOGENATION | CHEMISTRY, ORGANIC | OXYALLYL INTERMEDIATE | NORPINYL-NORBORNYL REARRANGEMENTS | CATIONS | carbocation | KETONES | halide | IODIDE-ION | CYCLOPENTENONES | diastereoselective | DERIVATIVES | CYCLIZATION
Journal Article
Angewandte Chemie International Edition, ISSN 1433-7851, 06/2000, Volume 39, Issue 11, pp. 1970 - 1973
Three new carbon–carbon bonds and up to five new stereocenters are created in the bicyclo[2.2.1]heptanones, such as 3, formed directly from a remarkable domino... 
Lewis acids | silicon organic compounds | domino reactions | synthetic methods | polycycles | ORGANIC-SYNTHESIS | KETONES | ANNULATION | CYCLOISOMERIZATION | <3+2>CYCLOADDITION | OXYALLYL INTERMEDIATE | <3+2>-CYCLOADDITION | CHEMISTRY, MULTIDISCIPLINARY | STEREOSELECTIVE SYNTHESIS | CYCLOPENTANES | CYCLIZATION
Journal Article
Organic Letters, ISSN 1523-7060, 02/2001, Volume 3, Issue 3, pp. 425 - 428
α-Amino α‘-fluoro ketones are shown to be inherently unstable intermediates. Evidence is presented that they undergo enolization toward the amino group... 
SUBSTITUTED OXYALLYL CATION | CYCLOADDITION | POTENT | KETOMETHYLENE DIPEPTIDE ISOSTERES | PEPTIDYL FLUOROMETHYL KETONES | CHEMISTRY, ORGANIC | INHIBITORS | STEREOCONTROLLED SYNTHESIS | Ketones - pharmacology | Protease Inhibitors - chemistry | Protease Inhibitors - pharmacology | Vinyl Compounds - chemistry | Cations | Ketones - chemistry
Journal Article
Chemical Communications, ISSN 1359-7345, 2009, Issue 38, pp. 5676 - 5688
The Nazarov reaction entails the electrocyclic closure of a conjugated pentadienyl cation to furnish a cyclopentenyl cation. In its conventional protocol, this... 
CROSS-CONJUGATED CYCLOHEXADIENONES | ORGANIC-SYNTHESIS | ROUTE | CYCLOADDITION REACTIONS | DIAZOMETHYL KETONES | ZWITTERIONS | PHOTOCHEMICAL REARRANGEMENTS | OXYALLYL INTERMEDIATE | CHEMISTRY, MULTIDISCIPLINARY | CYCLIZATION | GENERAL-METHOD
Journal Article
Chemical Communications, ISSN 1359-7345, 11/2010, Volume 46, Issue 47, pp. 894 - 8922
The (4+3)-cycloaddition of allylic cations to dienes is a powerful method for the direct synthesis of seven-membered rings. Recent developments in this area... 
CORE | FURAN | ASYMMETRIC-SYNTHESIS | PRECURSOR | STEREOSELECTIVITY | STABILIZED OXYALLYL CATIONS | 4+3-CYCLOADDITION APPROACH | INTERMEDIATE | IONS | INTRAMOLECULAR 4+3 CYCLOADDITIONS | CHEMISTRY, MULTIDISCIPLINARY
Journal Article
Organic Letters, ISSN 1523-7060, 05/2017, Volume 19, Issue 9, pp. 2414 - 2417
A new method to functionalize enamides via an intermediacy of unsymmetrical 2-amidoallyl cations is reported. Generated under mild Brønsted acid catalysis,... 
CATALYSIS | ETHERS | ACTIVATION MODE | IMINO-NAZAROV CYCLIZATION | ALLENE | CYCLOADDITIONS | CHEMISTRY, ORGANIC | INTERMEDIATE | OXYALLYL CATIONS | INDOLES
Journal Article
Tetrahedron, ISSN 0040-4020, 2005, Volume 61, Issue 32, pp. 7577 - 7606
Journal Article
Chemistry – A European Journal, ISSN 0947-6539, 03/2011, Volume 17, Issue 14, pp. 3812 - 3822
The use of heteroatom‐substituted oxyallyl cations in (4+3) cycloadditions has had a tremendous impact on the development of cycloaddition chemistry. Extensive... 
regioselectivity | oxyallyl cations | cycloaddition | heterocycles | nitrogen | CORE | ALLYLIC CATIONS | RINGS | DIASTEREOSELECTIVITY | CHEMISTRY, MULTIDISCIPLINARY | ALLENAMIDES | 3-OXIDOPYRIDINIUM | FURAN | STEREOSELECTIVITY | INTERMEDIATE | DFT ANALYSIS | Molecular Structure | Cations - chemistry | Cyclization | Nitrogen - chemistry | Stereoisomerism | Allyl Compounds - chemistry | Nitrogen | Cycloaddition | Cations | Sulfur | Prominences | Halogens
Journal Article
The Journal of Organic Chemistry, ISSN 0022-3263, 12/2016, Volume 81, Issue 24, pp. 12494 - 12498
The generation of dibrominated cyclopentenones via an interrupted Nazarov cyclization is reported. The installation of two bromine atoms occurs at the α and α′... 
OXIDATION | ALKENES | KETONE | CARBON | REACTIVITY | CHEMISTRY, ORGANIC | HALOGENATION | ALKYNES | OXYALLYL INTERMEDIATE | DERIVATIVES | Bromine | Usage | Chemical properties | Ring formation (Chemistry)
Journal Article
The Journal of Organic Chemistry, ISSN 0022-3263, 07/2017, Volume 82, Issue 13, pp. 6511 - 6527
Achieving ready-enantioselective access to multistereocenter-containing cyclopentyl rings is an area of great significance to organic synthesis. In this work,... 
ELECTROCYCLIZATION | TORQUOSELECTIVITY | 4+3 CYCLOADDITIONS | ASYMMETRIC-SYNTHESIS | CARBON | LEWIS-ACID | CONSTRUCTION | CHEMISTRY, ORGANIC | INTERMEDIATE | OXYALLYL CATIONS | CYCLOPENTENONES | Azo compounds | Amides | Usage | Chemical properties | Ring formation (Chemistry)
Journal Article
Tetrahedron Letters, ISSN 0040-4039, 10/2018, Volume 59, Issue 41, pp. 3674 - 3677
[Display omitted] •A new trapping method for aza-oxyallyl cations is described.•Aza-oxyallyl cations undergo novel (3+2) cycloadditions onto N-arylimines.•The... 
Aza-cyclopropanone | (3+2) cycloaddition | N-arylimine | Aza-oxyallyl | Imidazolidin-4-one | AZAOXYALLYL CATIONS | CHEMISTRY | CHEMISTRY, ORGANIC | SINGLET OXYGEN | INTERMEDIATE | ALLENE OXIDE | ACCESS
Journal Article
Chemical Society Reviews, ISSN 0306-0012, 4/2014, Volume 43, Issue 9, pp. 3136 - 3163
Journal Article