Enynes
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Synthesis of Chiral 1,3-Dienes through Ring-Closing Metathesis of Enantioenriched Enynes: Potential Precursors of Morphane Analogs
ABSTRACT A simple methodology for the synthesis of enynes by indium mediated diastereoselective allylation of aromatic N-tert-butanesulfinylimines bearing alkenyl groups at ortho-position with allyl bromide has been developed. The addition of the allyl indium intermediate to the chiral imine took place with excellent diastereoselectivity. Ruthenium-catalyzed
An. Acad. Bras. Ciênc.. Publicado em: 2018
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2. ENAMINONAS: SÍNTESE E APLICAÇÃO EM REAÇÕES DE CICLOISOMERIZAÇÃO E DE ACOPLAMENTO / Enaminones: Synthesis and application in cycloisomerization reactions and coupling
Neste trabalho é descrita a síntese de uma série de vinte 4-[alquil(aril) (2-propinilamino)]-3-alquen-2-onas [R2C(O)CH=C(R1)N(R)(CH2CCH), onde R2= CF3,CCl3, CO2Et; R1= Me, Et, Pr e R= Pr, Ph, Bn, 4-MeC6H4] obtidas com rendimentos entre 70-95%, através de uma reação de adição-1,4 seguida de substituição, entre aminas propargílicas [NH(R)(CH2CCH), o
Publicado em: 2009
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3. Teluretos vinÃlicos: reaÃÃes de acoplamento e investigaÃÃo da regio- e estereoquÃmica da hidroteluraÃÃo de alquinos
Vinylic tellurides are valuable synthetic intermediates and have recently been used in the total synthesis of many natural products. The hydrotelluration of alkynes is usually the method of choice to prepare Z-vinylic tellurides, in view of the easy access to the starting materials, the high regio- and stereoselectivity of the reaction and the practicality o
Publicado em: 2006
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4. Vinylic tellurides as precursors in a stereoselective and convergent route to Z-enynes and Z-trisubstituted enediynes
Teluretos vinílicos Z são transformados em cianocupratos vinílicos Z de ordem superior por transmetalação com dimetil- ou com n-butil(tienil)cianocupratos de lítio. Reação dos cianocupratos vinílicos Z assim obtidos com cloreto de zinco fornece presumivelmente espécies mistas de zinco e cobre que reagem com bromoalquinos levando a eninos e enediino
Journal of the Brazilian Chemical Society. Publicado em: 2004-06
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5. Palladium-catalyzed carbocyclization of 1,6-enynes leading to six-membered rings or oxidized five-membered trifluoroacetates
We describe palladium-catalyzed carbocyclization of 1,6-enynes leading to six-membered rings by water-originated hydride addition. Mechanistic features of this anomalous carbocyclization and isolation of a chiral five-membered C-Pd intermediate as an oxidized form of trifluoroacetate are also reported.
National Academy of Sciences.