Publications (19)14.06 Total impact
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Article: (2-tert-Butyl-5-hy-droxy-methyl-1,3-dioxan-5-yl)methanol.
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ABSTRACT: In the title compound, C(10)H(20)O(4), the dioxane ring adopts a chair conformation. The tert-butyl group occupies an equatorial position, and is staggered with respect to the O atoms of the dioxane ring. In the crystal, mol-ecules are connected by O-H⋯O hydrogen-bonds into zigzag chains of R(4) (4)(8) and R(2) (2)(12) ring motifs that run parallel to the a axis.Acta Crystallographica Section E Structure Reports Online 07/2012; 68(Pt 7):o2049. · 0.35 Impact Factor -
Article: 2,4,5-Tris(pyridin-4-yl)-4,5-dihydro-1,3-oxazole.
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ABSTRACT: In the title compound, C(18)H(14)N(4)O, the mol-ecules are disordered about a crystallographic twofold axis, leading to 50:50 disorder of the O- and N-atom sites within the oxazole ring. As a consequence, symmetry-related oxazole C-N and C-O bonds are averaged. The oxazole ring makes a dihedral angle of 6.920 (1)° with the pyridyl ring in the 2-position and 60.960 (2)° with the pyridyl rings in the 4- and 5-positions.Acta Crystallographica Section E Structure Reports Online 06/2012; 68(Pt 6):o1873. · 0.35 Impact Factor -
Article: 1,3,5-Tris(pyridin-3-yl)-2,4-diaza-penta-1,4-diene.
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ABSTRACT: In the solid state, the structure of the title compound, C(18)H(15)N(5), is stabilized by weak C-H⋯N interactions. Mol-ecules are arranged in layers parallel to the bc plane forming an inter-esting supra-molecular structure.Acta Crystallographica Section E Structure Reports Online 03/2012; 68(Pt 3):o746. · 0.35 Impact Factor -
Article: (2-tert-Butyl-5-hydroxymethyl-1,3- dioxan-5-yl)methanol
Acta Crystallographica Section E Structure Reports Online 01/2012; · 0.35 Impact Factor -
Article: 1-Benzyl-4-(naphthalen-1-yl)-1H-1,2,3-triazole.
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ABSTRACT: In the title compound, C(19)H(15)N(3), the benzyl group is almost perpendicular to the triazole ring [dihedral angle = 80.64 (8)°], while the napthyl group makes an angle of 30.27 (12)° with the plane of the triazole ring. This conformation is different from the 1-benzyl-4-phenyl-1H-1,2,3-triazole analogue, which has the benzyl ring system at an angle of 87.94° and the phenyl group at an angle of 3.35° to the plane of the triazole ring.Acta Crystallographica Section E Structure Reports Online 07/2011; 67(Pt 7):o1856. · 0.35 Impact Factor -
Article: Practical Synthesis of Optically Active Alcohols via Asymmetric Transfer Hydrogenation of Aromatic Ketones Using Chiral Rh(III)–Monosulfonamide Ligand Complex in Aqueous Media
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ABSTRACT: A series of monosulfonamide derivatives were synthesized and tested as chiral ligands in the Ru(II),Rh(III)-catalyzed transfer hydrogenation of aromatic ketones in aqueous sodium formate and isopropanol/potassium hydroxide. Possible secondary Cp*methyl-π sulfonamide benzene ring interaction is envisaged and supported by calculations.Synthetic Communications 01/2011; 41(1):73-84. · 1.06 Impact Factor -
Article: Asymmetric transfer hydrogenation of prochiral ketones in aqueous media with chiral water-soluble and heterogenized bifunctional catalysts of the RhCp*-type ligand.
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ABSTRACT: Asymmetric transfer hydrogenation (ATH) of prochiral aromatic ketones was carried out with a water-soluble complex of Rh(III)Cp* and mononitrobenzenesulfonamide bidentate ligand (1R,2R)-N-(2-aminocyclohexyl)-4-nitrobenzenesulfonamide 1 derived from chiral cyclohexane-1,2-diamine. Aqueous sodium formate was used as the hydride source. The reaction afforded the chiral alcohols in good enantioselectivities (79-93%) and yields (>99%). The modified monosulfonamide ligand was also covalently immobilized on solid phase such as silica, resin, and mesoporous SBA-15 silica and then explored as a catalyst with Rh(III)Cp* in the ATH of acetophenone.Chirality 09/2010; 23(2):178-84. · 2.35 Impact Factor -
Article: Benzene-1,3,5-triyl tris-(methane-sulfonate).
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ABSTRACT: In the mol-ecule of the title compound, C(9)H(12)O(9)S(3), the two methanesulfonate groups re located one above and one below the ring plane. The C-O-S angle range is 119.3 (2)-121.1 (2)°. This conformation is different from that of the benzene analog 1,2,5-tris-(p-toluene-sulfonate), which is a three-legged 'table' with all fragments of the p-toluene-sulfonate on top of the benzene ring. In the crystal, the supra-molecular aggregation is completed by the presence of C-H⋯O hydrogen bonds.Acta Crystallographica Section E Structure Reports Online 01/2010; 66(Pt 4):o739. · 0.35 Impact Factor -
Article: Synthesis of Chiral Aromatic Alcohols: Use of New C2-Symmetric RhIIICp∗, RuII(cymene), or RuII(benzene) Complexes Containing Chiral Diaminocyclohexane Ligand as Asymmetric Transfer Hydrogenation Catalyst
Synthetic Communications 08/2009; 39(15):2737-2746. · 1.06 Impact Factor -
Article: N-(2-Hydroxy-ethyl)-2-[3-(p-tol-yl)triazen-1-yl]benzamide.
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ABSTRACT: In the solid state, the structure of the title compound, C(16)H(18)N(4)O(2), is stabilized by inter-molecular N-H⋯O and O-H⋯O hydrogen bonds. These hydrogen bonds arrange the mol-ecules into a double-layer supra-molecular structure. The mol-ecular conformation is is consolidated by an intra-molecular N-H⋯N hydrogen bond. The dihedral angle between the aromatic rings is 8.01 (10)°Acta Crystallographica Section E Structure Reports Online 01/2009; 65(Pt 5):o990-1. · 0.35 Impact Factor -
Article: Stereoselective Synthesis of Rubrenoic and nor‐Rubrenoic acids
Synthetic Communications 01/2008; 38(1):54-71. · 1.06 Impact Factor -
Article: Synthesis of analogs of amathamide A and their preliminary antimicrobial activity.
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ABSTRACT: Syntheses of three non-brominated analogs of amathamide A (1), a natural alkaloid isolated from the Tasmanian marine bryozoan Amathia wilsoni, are described. Antimicrobial activity against Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Pseudomona aeruginosa, and Candida albicans was tested. Test results for amathamide A (1) showed a weak activity against C. albicans and E. coli. The three non-natural analogs 2-4 proved to be inactive compounds.Molecules 02/2005; 10(1):295-301. · 2.39 Impact Factor -
Article: Enantioselective Ring Opening of meso-Cyclohexene Epoxide with Phenyllithium Catalyzed by Chiral Schiff Base Ligands
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ABSTRACT: A library of chiral Schiff base ligands was synthesized from aromatic aldehydes and chiral amino alcohols. These ligands were then screened as catalysts in the asymmetric ring opening of meso-cyclohexene epoxide with phenyllithium to give (1S,2R)- phenylcyclohexanol in 9-67% ee.Revista de la Sociedad Química de México. 01/2004; -
Article: Asymmetric Synthesis of Naturally Occurring b-Hydroxyamides (R)-Tembamide and (R)-Aegeline
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ABSTRACT: Chiral cyanohydrins were synthesized from anisaldehyde and trimethylsilylcyanide catalyzed by a chiral Schiff-base titanium complex. Cyanohydrins were converted into chiral the ß-hydroxyamides, (R)-Tembamide and (R)-Aegeline.Revista de la Sociedad Química de México. 01/2001; -
Article: Asymmetric Synthesis of Naturally Occurring β-Hydroxyamides (R)-Tembamide and (R)-Aegeline
Revista de la Sociedad Química de México. 01/2001; -
Article: Synthesis of Some New Chiral Sulfonamide Ligands
Synthetic Communications 01/2000; 30(1):147-155. · 1.06 Impact Factor -
Article: Oxidation of sulfides to chiral sulfoxides using Schiff base-vanadium (IV) complexes
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ABSTRACT: A library of Schiff base ligands was synthesized from salicylaldehyde by reaction with various β-amino alcohols. These ligands were used with vanadium (IV) to screen for the enantioselective oxidation of sulfides to chiral sulfoxides. -
Article: Steric effects in the design of chiral Schiff base-titanium complexes: new catalysts for asymmetric trimethylsilylcyanation of aldehydes
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ABSTRACT: New chiral Schiff base ligands derived from salicylaldehydes bearing bulky ring substituents were synthesized by reaction with various amino alcohols. These new ligands were used with titanium tetraisopropoxide to study steric effects on the enantioselectivity of the trimethylsilylcyanation of aldehydes. © 2002 Published by Elsevier Science Ltd. -
Article: A study of substituent effects on the enantioselective trimethylsilylcyanation of benzaldehyde catalyzed by chiral Schiff base–titanium(IV) complexes
Tetrahedron Asymmetry 16(6):1167-1174. · 2.65 Impact Factor
Top co-authors
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Institutions
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2005–2012
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Instituto Tecnológico de Tijuana (ITT)
Tijuana, Estado de Baja California, Mexico
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2000–2009
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Tijuana Institute Of Technology
Tijuana, Estado de Baja California, Mexico
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