Survey of Synthetic Approaches to Natural (Peyssonenynes) and Unnatural Acetoxyenediynes
Identifieur interne : 001578 ( Istex/Corpus ); précédent : 001577; suivant : 001579Survey of Synthetic Approaches to Natural (Peyssonenynes) and Unnatural Acetoxyenediynes
Auteurs : Patricia García-Domínguez ; Rosana Alvarez ; Ángel R. De LeraSource :
- European Journal of Organic Chemistry [ 1434-193X ] ; 2012-09.
English descriptors
- KwdEn :
- Ac2o, Acetate, Acetic, Acetic anhydride, Acetoxyenediyne, Acetoxyenediynes, Acetoxyenyne, Acetoxyenynes, Alkyne, Amide, Angew, Anhydride, Anion, Aqueous solution, Brine, Calcd, Carbonate, Cdcl3, Chem, Colorless, Column chromatography, Deprotection, Diyne, Diynyl, Diynyl anion, Dmap, Dropwise, Enol, Enol acetate, Enol acetates, Ester, Et2o, Et3n, Ether, Etoac, Further purification, General procedure, Gmbh, Hexane, Hplc, Hrms, Iodoalkyne, Ipr3si, Isomer, Ketone, Kgaa, Lera, Lett, Lhmds, Lithium, Meoh, Mmol, Model system, Nacl, Natural products, Nbu4nf, Nbuli, Next step, Nh4cl, Organic layers, Palmitic acid, Peyssonenynes, Piperidine, Potassium carbonate, Propargylic, Propargylic ketone, Propargylic ketones, Purification, Reaction mixture, Reagent, Room temperature, Silica, Sonogashira, Tbaf, Terminal alkynes, Tetrahedron, Tetrahedron lett, Title compound, Title product, Tmeda, Unnatural acetoxyenediynes, Unsymmetrical, Verlag, Verlag gmbh, Weinheim, Weinreb, Weinreb amide.
- Teeft :
- Ac2o, Acetate, Acetic, Acetic anhydride, Acetoxyenediyne, Acetoxyenediynes, Acetoxyenyne, Acetoxyenynes, Alkyne, Amide, Angew, Anhydride, Anion, Aqueous solution, Brine, Calcd, Carbonate, Cdcl3, Chem, Colorless, Column chromatography, Deprotection, Diyne, Diynyl, Diynyl anion, Dmap, Dropwise, Enol, Enol acetate, Enol acetates, Ester, Et2o, Et3n, Ether, Etoac, Further purification, General procedure, Gmbh, Hexane, Hplc, Hrms, Iodoalkyne, Ipr3si, Isomer, Ketone, Kgaa, Lera, Lett, Lhmds, Lithium, Meoh, Mmol, Model system, Nacl, Natural products, Nbu4nf, Nbuli, Next step, Nh4cl, Organic layers, Palmitic acid, Peyssonenynes, Piperidine, Potassium carbonate, Propargylic, Propargylic ketone, Propargylic ketones, Purification, Reaction mixture, Reagent, Room temperature, Silica, Sonogashira, Tbaf, Terminal alkynes, Tetrahedron, Tetrahedron lett, Title compound, Title product, Tmeda, Unnatural acetoxyenediynes, Unsymmetrical, Verlag, Verlag gmbh, Weinheim, Weinreb, Weinreb amide.
Abstract
Four convergent synthetic approaches to acetoxyenediynes have been explored to gain access to peyssonenynes A and B, which are natural products isolated from the red alga Peyssonelia caulifera. After optimization of the routes with a palmitic acid based model system, the synthesis of the peyssonenynes was completed by using, as the key steps, 1) Ni/Cu co‐catalyzed cross‐coupling of terminal alkynes, 2) Sonogashira cross‐coupling, 3) the addition of a diynyl anion to a Weinreb amide, and 4) the previously reported Cadiot–Chodkiewicz cross‐coupling reaction. Because bulky amide bases stereoselectively provided the (E)‐ and (Z)‐acetoxyenynes from the precursor ynones, the cross‐coupling routes to obtaining the acetoxyenediynes by using these stereochemically homogeneous intermediates are comparable to the alternatives in which enolacetate formation of the acetoxyenediyne motif takes place at a late stage in the synthesis.
Url:
DOI: 10.1002/ejoc.201200246
Links to Exploration step
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<front><div type="abstract" xml:lang="en">Four convergent synthetic approaches to acetoxyenediynes have been explored to gain access to peyssonenynes A and B, which are natural products isolated from the red alga Peyssonelia caulifera. After optimization of the routes with a palmitic acid based model system, the synthesis of the peyssonenynes was completed by using, as the key steps, 1) Ni/Cu co‐catalyzed cross‐coupling of terminal alkynes, 2) Sonogashira cross‐coupling, 3) the addition of a diynyl anion to a Weinreb amide, and 4) the previously reported Cadiot–Chodkiewicz cross‐coupling reaction. Because bulky amide bases stereoselectively provided the (E)‐ and (Z)‐acetoxyenynes from the precursor ynones, the cross‐coupling routes to obtaining the acetoxyenediynes by using these stereochemically homogeneous intermediates are comparable to the alternatives in which enolacetate formation of the acetoxyenediyne motif takes place at a late stage in the synthesis.</div>
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. After optimization of the routes with a palmitic acid based model system, the synthesis of the peyssonenynes was completed by using, as the key steps, 1) Ni/Cu co‐catalyzed cross‐coupling of terminal alkynes, 2) Sonogashira cross‐coupling, 3) the addition of a diynyl anion to a Weinreb amide, and 4) the previously reported Cadiot–Chodkiewicz cross‐coupling reaction. Because bulky amide bases stereoselectively provided the (<hi rend="italic">E</hi>
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<abstract lang="en">Four convergent synthetic approaches to acetoxyenediynes have been explored to gain access to peyssonenynes A and B, which are natural products isolated from the red alga Peyssonelia caulifera. After optimization of the routes with a palmitic acid based model system, the synthesis of the peyssonenynes was completed by using, as the key steps, 1) Ni/Cu co‐catalyzed cross‐coupling of terminal alkynes, 2) Sonogashira cross‐coupling, 3) the addition of a diynyl anion to a Weinreb amide, and 4) the previously reported Cadiot–Chodkiewicz cross‐coupling reaction. Because bulky amide bases stereoselectively provided the (E)‐ and (Z)‐acetoxyenynes from the precursor ynones, the cross‐coupling routes to obtaining the acetoxyenediynes by using these stereochemically homogeneous intermediates are comparable to the alternatives in which enolacetate formation of the acetoxyenediyne motif takes place at a late stage in the synthesis.</abstract>
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