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Listar por palabra clave "Asymmetric catalysis"

Mostrando ítems 1-20 de 23

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Asymmetric counteranion-directed catalytic hosomi-sakurai reaction

Mahlau, Manuel; García García, Pilar; List, Benjamin (Wiley-VCH Verlag, 2012)

[EN] Counteranion control enables the enantioselective, organo Lewis acid catalyzed Hosomi¿Sakurai reaction of (hetero)aromatic aldehydes and allylsilanes using an easily handled disulfonimide precatalyst (see scheme). The ...
C2 symmetrical nickel complexes derived from a-amino amides as efficient catalysts for the enantioselective addition of dialkylzinc reagents to aldehydes

Escorihuela Fuentes, Jorge; Altava Benito, Belén; Burguete Azcarate, Mª Isabel; Luis Lafuente, Santiago (Elsevier, 2013-01-14)

[EN] A series of C2 symmetrical 1:2 Ni:L complexes derived from a-amino amides were studied for the enantioselective addition of dialkylzinc reagents to aldehydes. Different structural elements on the ligands seem to play ...
Catalytic Asymmetric Formal [3+2] Cycloaddition of 2-Isocyanatomalonate Esters and Unsaturated Imines: Synthesis of Highly Substituted Chiral g-Lactams

Espinosa, Miguel; Blay, Gonzalo; Cardona, Luz; Muñoz Roca, María Del Carmen; Pedro, José R. (John Wiley & Sons, 2017-10-20)

[EN] Unlike their isocyano and isothiocyanato analogues, isocyanato esters remain almost unexplored as formal 1,3-dipoles in asymmetric catalytic reactions. The first asymmetric formal [3+2] cycloaddition involving ...
Catalytic Enantioselective Aza-Reformatsky Reaction with Cyclic Imines

De Munck, Lode; Vila, Carlos; Muñoz Roca, María del Carmen; Pedro, José R. (Wiley, 2016-12-05)

A catalytic highly enantioselective aza-Reformatsky reaction with cyclic aldimines and ketimines for the synthesis of chiral b-amino esters with good yields and excellent enantioselectivities is reported.Areadily ...
Catalytic enantioselective aza-Reformatsky reaction with seven-membered cyclic imines dibenzo[b,f][1,4]oxazepines

De Munck, Lode; Sukowski, Verena; Vila, Carlos; Muñoz Roca, María Del Carmen; Pedro, José R. (Royal Society of Chemistry, 2017-08-01)

[EN] A catalytic enantioselective aza-Reformatsky reaction is reported with cyclic dibenzo[b,f][1,4]oxazepines and ethyl iodoacetate leading to the synthesis of chiral ethyl 2-(10,11-dihydrodibenzo[b,f][1,4]oxazepin-11- ...
Catalytic Enantioselective Conjugate Alkynylation of α,β-Unsaturated 1,1,1-Trifluoromethyl Ketones with Terminal Alkynes

Sanz Marco, Amparo; Blay, Gonzalo; Muñoz Roca, María del Carmen; Pedro, José R. (Wiley, 2016-07-11)

The first catalytic enantioselective conjugate alkynylation of α,β-unsaturated 1,1,1-trifluoromethyl ketones has been carried out. Terminal alkynes and 1,3-diynes were treated with trifluoromethyl ketones in the presence ...
Efficient chirality switching in the addition of diethylzinc to aldehydes in the presence of simple chiral alpha-amino amides

Burguete, M.I.; Collado, M.; Escorihuela Fuentes, Jorge; Luis Lafuente, Santiago (Wiley, 2007-09)
Enantioselective Friedel-Crafts Alkylation of Indoles with (E)-1-Aryl-4-benzyloxybut-2-en-1-ones Catalyzed by an (R)-3,3-Br2BINOLate-Hafnium(IV) Complex

Muñoz Roca, María del Carmen (Wiley-VCH Verlag, 2013-02-11)

A highly enantioselective Friedel–Crafts reaction of unprotected indoles with (E)-1-aryl-4-benzyloxybut-2-en-1-ones catalyzed by a new chiral [Hf{(R)-3,3′-Br2-BINOL}(OtBu)2]2 complex has been developed to functionalize the ...
Enantioselective LaIII-pyBOX-Catalyzed Nitro-Michael Addition to (E)-2-Azachalcones

Blay Llinares, Gonzalo; Incerti, Celia; Muñoz Roca, María del Carmen; Pedro Llinares, Jose Ramón (Wiley-VCH Verlag, 2013-03)

A [La(OTf)3] complex with a new pyBOX ligand bearing a bulky 1-naphthylmethyl substituent at the 4-position of the oxazoline ring catalyzes the conjugate addition of nitroalkanes to a broad range of (E)-2-azachalcones, ...
Enantioselective Synthesis of 4-Substituted Dihydrocoumarins through a Zinc Bis(hydroxyamide)-Catalyzed Conjugate Addition of Terminal Alkynes

Blay, Gonzalo; Muñoz Roca, María del Carmen; Pedro, Jose R; Sanz-Marco, Amparo (Wiley-VCH Verlag, 2013-04-15)

A new enantioselective catalyst for the conjugate addition of terminal alkynes has been developed. Terminal alkynes react with 3-alkoxycarbonylcoumarins in the presence of diethylzinc and bis(hydroxyamide) ligands to ...
Lanthanum-pyBOX complexes as catalysts for the enantioselective conjugate addition of malonate esters to beta-gamma-unsaturated alfa-ketimino esters

Espinosa, M.; Blay, G.; Cardona, L.; Fernández, I.; Muñoz Roca, María Del Carmen; Pedro, J.R. (Taylor & Francis, 2018)

[EN] In this paper, we report the application of chiral complexes of La(III) with pyBOX ligands as Lewis acid catalysts in the conjugate addition of malonic esters to N-tosyl imines derived from ß,gamma-unsaturated alfa-keto ...
Metal organic frameworks as heterogeneous catalysts for the production of fine chemicals

Dhakshinamoorthy, Amarajothi; Opanasenko, Maksym; Cejka, Jiri; García Gómez, Hermenegildo (Royal Society of Chemistry, 2013)

[EN] This review focuses on the use of metal organic frameworks (MOFs) as catalysts for the synthesis of fine chemicals. While petrochemistry is characterized by gas phase reactions, in which MOFs cannot compete with robust ...
Organocatalytic Enantioselective Alkylation of Pyrazol-3-ones with Isatin-Derived Ketimines: Stereocontrolled Construction of Vicinal Tetrasubstituted Stereocenters

Amr, Fares Ibrahim; Vila, Carlos; Blay, Gonzalo; Muñoz Roca, María del Carmen; Pedro, José R. (Wiley, 2016-05-19)

A quinine-derived thiourea catalysed the enantioselective addition of 4-substituted pyrazolones to isatin-derived ketimines, providing a variety of aminooxindole-pyrazolone adducts containing congested vicinal ...
Organocatalytic Enantioselective Friedel-Crafts Alkylation of 1-Naphthol Derivatives and Activated Phenols with Ethyl Trifluoropyruvate

Montesinos Magraner, Marc; Vila, Carlos; Blay, Gonzalo; Fernández, Isabel; Muñoz Roca, María del Carmen; Pedro, José R. (Wiley, 2015-10-12)

An organocatalytic enantioselective Friedel–Crafts alkylation of a series of substituted 1- naphthol derivatives and activated phenols with ethyl trifluoropyruvate, catalyzed by a quinine-derived squaramide, is presented. ...
Organocatalytic Enantioselective Friedel-Crafts Aminoalkylation of Indoles in the Carbocyclic Ring

Montesinos Magraner, Marc; Vila, Carlos; Rendón Patiño, Alejandra; Blay, Gonzalo; Fernández, Isabel; Muñoz Roca, María del Carmen; Pedro, José R. (American Chemical Society, 2016)

The first general catalytic method for the, so far elusive, enantioselective Friedel−Crafts functionalization of indoles in the carbocyclic ring is presented. This transformation contrasts with the usual tendency of these ...
Organocatalytic Enantioselective Strecker Reaction with Seven-Membered Cyclic Imines

Lluna Galán, C.; Blay, G.; Fernández, I.; Muñoz Roca, María Del Carmen; Pedro, J. R.; Vila, C. (John Wiley & Sons, 2018)

[EN] A highly enantioselective Strecker reaction with dibenzo[b,f][1,4]oxazepines has been described using a dihydroquinine-derived thiourea as organocatalyst. The reaction affords chiral 10,11-dihydrodibenzo[b,f][1,4] ...
Organocatalytic Enantioselective Synthesis of Pyrazoles Bearing a Quaternary Stereocenter

Vila, Carlos; Amr, Fares Ibrahim; Blay, Gonzalo; Muñoz Roca, María del Carmen; Pedro, José R. (Wiley, 2016-05-20)

An efficient one-pot asymmetric synthesis of pyrazoles bearing a chiral quaternary stereocenter has been developed. Quinine-derived thiourea catalyzed the enantioselective addition of pyrazolones to isatin-derived ketimines, ...
Polymer-supported chiral -amino amides for the asymmetricaddition of diethylzinc to aldehydes: Transforming an inactivehomogeneous system into an efficient catalyst

Escorihuela Fuentes, Jorge; Gonzalez Mendoza, Laura; Altava Benito, Belén; Burguete Azcarate, Mª Isabel; Luis Lafuente, Santiago (Elsevier, 2013-07-10)

[EN] A series of polymer-supported -amino amides derived from natural amino acids have been easily syn-thesized and fully characterized. Their chiral Zn (II) complexes catalyzed the enantioselective additionof diethylzinc ...
Rational Design of Simple Organocatalysts for the HSiCl3 Enantioselective Reduction of (E)-N-(1-Phenylethylidene)aniline

Maciá, María; Porcar, Raúl; Martí-Centelles, Vicente; García-Verdugo, Eduardo; Burguete, Maria Isabel; Luis, Santiago V. (MDPI AG, 2021-11)

[EN] Prolinamides are well-known organocatalysts for the HSiCl3 reduction of imines; however, custom design of catalysts is based on trial-and-error experiments. In this work, we have used a combination of computational ...
Regio-, Diastereo-, and Enantioselective Organocatalytic Addition of 4-Substituted Pyrazolones to Isatin-Dereved Nitroalkenes

Vila, C.; Dharmaraj, N. R.; Faubel, A.; Blay, G.; Cardona, M. L.; Muñoz Roca, María Del Carmen; Pedro, J. R. (John Wiley & Sons, 2019-05-26)

[EN] Hydroquinine 2,5-diphenyl-4,6-pyrimidinediyl diether [(DHQ)(2)Pyr] catalyzed the regio-, diastereo-, and enantioselective addition of 4-substituted pyrazolones to isatin-derived nitroalkenes, providing a variety of ...