The Experts below are selected from a list of 2028 Experts worldwide ranked by ideXlab platform
Peter Langer - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of 2-Alkenyl-3-(alkoxycarbonyl)furans Based on Feist−Benary Cyclocondensation of (2,4-Dioxobutylidene)phosphoranes with α-Haloketones and α-Chloracetaldehyde
The Journal of organic chemistry, 2006Co-Authors: Gerson Mross, Edith Holtz, Peter LangerAbstract:3-Acyl-2-alkenylfurans were prepared by "Feist-Benary cyclocondensation" of (2,4-dioxobutylidene)phosphoranes with chloracetaldehyde and alpha-Haloketones and subsequent Wittig reactions.
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synthesis of 2 alkenyl 3 alkoxycarbonyl furans based on feist benary cyclocondensation of 2 4 dioxobutylidene phosphoranes with α Haloketones and α chloracetaldehyde
Journal of Organic Chemistry, 2006Co-Authors: Gerson Mross, Edith Holtz, Peter LangerAbstract:3-Acyl-2-alkenylfurans were prepared by "Feist-Benary cyclocondensation" of (2,4-dioxobutylidene)phosphoranes with chloracetaldehyde and alpha-Haloketones and subsequent Wittig reactions.
Gerson Mross - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of 2-Alkenyl-3-(alkoxycarbonyl)furans Based on Feist−Benary Cyclocondensation of (2,4-Dioxobutylidene)phosphoranes with α-Haloketones and α-Chloracetaldehyde
The Journal of organic chemistry, 2006Co-Authors: Gerson Mross, Edith Holtz, Peter LangerAbstract:3-Acyl-2-alkenylfurans were prepared by "Feist-Benary cyclocondensation" of (2,4-dioxobutylidene)phosphoranes with chloracetaldehyde and alpha-Haloketones and subsequent Wittig reactions.
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synthesis of 2 alkenyl 3 alkoxycarbonyl furans based on feist benary cyclocondensation of 2 4 dioxobutylidene phosphoranes with α Haloketones and α chloracetaldehyde
Journal of Organic Chemistry, 2006Co-Authors: Gerson Mross, Edith Holtz, Peter LangerAbstract:3-Acyl-2-alkenylfurans were prepared by "Feist-Benary cyclocondensation" of (2,4-dioxobutylidene)phosphoranes with chloracetaldehyde and alpha-Haloketones and subsequent Wittig reactions.
Qiang Tang - One of the best experts on this subject based on the ideXlab platform.
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An efficient Darzens reaction promoted by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)
Tetrahedron Letters, 2019Co-Authors: Juan Luo, Minghao Zhang, Qiang TangAbstract:Abstract An efficient DBU promoted Darzens reaction utilising α-Haloketones containing an enolizable α′-hydrogen is reported. This method diastereoselectively afforded the corresponding α , β -epoxy ketones good to excellent yields in an one-pot reaction without using any transition metals or additives. Furthermore, Haloketones without an α ′-hydrogen are also applicable in this reaction.
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Catalyst-free formation of 1,4-diketones by addition of silyl enolates to oxyallyl zwitterions in situ generated from α-Haloketones
RSC Advances, 2015Co-Authors: Juan Luo, Qihua Jiang, Hao Chen, Qiang TangAbstract:Reported here is the exclusive formation of 1,4-diketones by the uncatalyzed reaction of silyl enolates and α-Haloketones. Enolates I are inherently more likely to react with α-Haloketones II at the carbonyl carbon to produce halohydrin derivatives III or 2-(2-oxoethyl)-oxiranes IV. Thus, a variety of metal-catalyzed coupling reactions have been developed to avoid the undesired reaction when attempting the preparation of 1,4-diketones. We found that the oxyallyl zwitterions in situ generated from α-Haloketones enabled the addition of silyl enolates to the α-carbonyl position to exclusively form 1,4-diketones in weakly basic conditions. Various types of silyl enolates and α-Haloketones were applied to the catalyst-free coupling.
Edith Holtz - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of 2-Alkenyl-3-(alkoxycarbonyl)furans Based on Feist−Benary Cyclocondensation of (2,4-Dioxobutylidene)phosphoranes with α-Haloketones and α-Chloracetaldehyde
The Journal of organic chemistry, 2006Co-Authors: Gerson Mross, Edith Holtz, Peter LangerAbstract:3-Acyl-2-alkenylfurans were prepared by "Feist-Benary cyclocondensation" of (2,4-dioxobutylidene)phosphoranes with chloracetaldehyde and alpha-Haloketones and subsequent Wittig reactions.
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synthesis of 2 alkenyl 3 alkoxycarbonyl furans based on feist benary cyclocondensation of 2 4 dioxobutylidene phosphoranes with α Haloketones and α chloracetaldehyde
Journal of Organic Chemistry, 2006Co-Authors: Gerson Mross, Edith Holtz, Peter LangerAbstract:3-Acyl-2-alkenylfurans were prepared by "Feist-Benary cyclocondensation" of (2,4-dioxobutylidene)phosphoranes with chloracetaldehyde and alpha-Haloketones and subsequent Wittig reactions.
Juan Luo - One of the best experts on this subject based on the ideXlab platform.
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An efficient Darzens reaction promoted by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)
Tetrahedron Letters, 2019Co-Authors: Juan Luo, Minghao Zhang, Qiang TangAbstract:Abstract An efficient DBU promoted Darzens reaction utilising α-Haloketones containing an enolizable α′-hydrogen is reported. This method diastereoselectively afforded the corresponding α , β -epoxy ketones good to excellent yields in an one-pot reaction without using any transition metals or additives. Furthermore, Haloketones without an α ′-hydrogen are also applicable in this reaction.
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Catalyst-free formation of 1,4-diketones by addition of silyl enolates to oxyallyl zwitterions in situ generated from α-Haloketones
RSC Advances, 2015Co-Authors: Juan Luo, Qihua Jiang, Hao Chen, Qiang TangAbstract:Reported here is the exclusive formation of 1,4-diketones by the uncatalyzed reaction of silyl enolates and α-Haloketones. Enolates I are inherently more likely to react with α-Haloketones II at the carbonyl carbon to produce halohydrin derivatives III or 2-(2-oxoethyl)-oxiranes IV. Thus, a variety of metal-catalyzed coupling reactions have been developed to avoid the undesired reaction when attempting the preparation of 1,4-diketones. We found that the oxyallyl zwitterions in situ generated from α-Haloketones enabled the addition of silyl enolates to the α-carbonyl position to exclusively form 1,4-diketones in weakly basic conditions. Various types of silyl enolates and α-Haloketones were applied to the catalyst-free coupling.
