Výsledky vyhledávání - "Cuauhtemoc Alvarado"

Weakly bounded intermediates as a previous step towards highly-enantioselective iminium type additions of β-keto-sulfoxides and -sulfones

Autor: Cuauhtemoc Alvarado, Sergio Díaz-Tendero, Enrique M. Arpa, José Alemán, María Frías

Publikováno v: Journal of Molecular Catalysis A: Chemical. 423:308-318

A joined experimental and theoretical study on the addition of β-keto-sulfoxides and -sulfones to enals catalyzed with amine compounds of the Jorgensen-Hayashi type is presented. Theoretically, density functional theory calculations are used to expl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9f2c637f8b990249cc3152ba99b01b04
https://doi.org/10.1016/j.molcata.2016.03.013

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Intramolecular hydrogen-bond activation for the addition of nucleophilic imines: 2-hydroxybenzophenone as a chemical auxiliary

Autor: Alberto Fraile, Andrea Guerrero-Corella, Ana Martín-Sómer, Sergio Díaz-Tendero, Cuauhtemoc Alvarado, Houcine Choubane, Mortada Daaou, M. Carmen Maestro, Alberto F. Garrido-Castro, José Alemán

Publikováno v: Biblos-e Archivo. Repositorio Institucional de la UAM
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The addition of nucleophilic imines, using 2-hydroxybenzophenone as a chemical auxiliary, is presented. An intramolecular six-membered ring via hydrogen bonding that enhances the reactivity and selectivity is the key of this strategy, which is suppor

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20d0c65e3b474493c28f64b2064187e9
http://hdl.handle.net/10486/687103

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Asymmetric Synthesis of Rauhut–Currier type Products by a Regioselective Mukaiyama Reaction under Bifunctional Catalysis

Autor: Cuauhtemoc Alvarado, José Alemán, María Frías, Rubén Mas-Ballesté, Saira Arias

Publikováno v: Journal of the American Chemical Society
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The reactivity and the regioselective functionalization of silyl–diene enol ethers under a bifunctional organocatalyst provokes a dramatic change in the regioselectivity, from the 1,5- to the 1,3-functionalization. This variation makes possible the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a49fe4358aca85cffb17d123f10c0644

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Highly Stereoselective Synthesis of Tertiary Propargylic Centers and Their Isomerization to Enantiomerically Enriched Allenes

Autor: Jose Luis Garcia Ruano, Vanesa Marcos, José Alemán, Leyre Marzo, Cuauhtemoc Alvarado

Publikováno v: Chemistry - A European Journal. 18:9775-9779

Allenes are important compounds that exhibit axial chirality and are present in a large number of medicinal and natural products. One of the most frequently used methods for obtaining racemic allenes involves the isomerization of propargylic centers.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e423e3665d3176bc2342adc34eb3ac63
https://doi.org/10.1002/chem.201201607

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Expanding the Scope of Arylsulfonylacetylenes as Alkynylating Reagents and Mechanistic Insights in the Formation of Csp2Csp and Csp3Csp Bonds from Organolithiums

Autor: Alberto Fraile, José Alemán, Sergio Díaz-Tendero, Mariola Tortosa, Jose Luis Garcia Ruano, Leyre Marzo, Cuauhtemoc Alvarado

Publikováno v: Chemistry – A European Journal. 18:8414-8422

We describe the unexpected behavior of the arylsulfonylacetylenes, which suffer an "anti-Michael" addition of organolithiums producing their alkynylation under very mild conditions. The broad scope, excellent yields, and simplicity of the experimenta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b80e766900daa4557d3bcff0b906068e
https://doi.org/10.1002/chem.201200939

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Arylsulfonylacetylenes as Alkynylating Reagents of C sp 2H Bonds Activated with Lithium Bases

Autor: Cuauhtemoc Alvarado, Mariola Tortosa, José L. García Ruano, Alberto Fraile, Leyre Marzo, José Alemán, Sergio Díaz-Tendero

Publikováno v: Angewandte Chemie International Edition. 51:2712-2716

Chameleon: a new strategy for the synthesis of a wide variety of alkynyl derivatives by the reaction of substituted arylsulfonylacetylenes with organolithium species is described. The high yields, the simplicity of the experimental procedure, the bro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5049a78a41c67e140281a1a671eb67f0
https://doi.org/10.1002/anie.201107821

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