Eusebio Leal Spengler
نویسندگان
چکیده
Eusebio Leal Spengler, reconocido defensor del patrimonio arquitectónico de Cuba, fue una figura alcance internacional no solo por su memorable labor en país, donde desempeñaba el cargo Historiador la Ciudad La Habana. Desde ese sitial un gran promotor recuperación rico edificado Cuba y destacado inversiones carácter para refuncionalizar dar nuevos usos vinculados al turismo a numerosos edificios patrimoniales ciudad. Como ensayista escritor sobre temas arte restauración monumentos, pensamiento, sus ideas propuestas despertaron mayor interés entre los estudiosos e intelectuales toda Latinoamérica.
منابع مشابه
Thiourea-catalyzed enantioselective iso-Pictet-Spengler reactions.
A one-pot condensation of isotryptamines and aldehydes that affords enantiomerically enriched 4-substituted tetrahydro-γ-carbolines is reported. The reaction is induced by a chiral thiourea/benzoic acid dual catalyst system. Purification of the N-Boc-protected products by trituration or crystallization provides the optically pure tetrahydro-γ-carboline derivatives in a scalable and highly pract...
متن کاملA Pictet-Spengler ligation for protein chemical modification.
Aldehyde- and ketone-functionalized proteins are appealing substrates for the development of chemically modified biotherapeutics and protein-based materials. Their reactive carbonyl groups are typically conjugated with α-effect nucleophiles, such as substituted hydrazines and alkoxyamines, to generate hydrazones and oximes, respectively. However, the resulting C=N linkages are susceptible to hy...
متن کاملMild and efficient cyanuric chloride catalyzed Pictet–Spengler reaction
A practical, mild and efficient protocol for the Pictet-Spengler reaction catalyzed by cyanuric chloride (trichloro-1,3,5-triazine, TCT) is described. The 6-endo cyclization of tryptophan/tryptamine and modified Pictet-Spengler substrates with both electron-withdrawing and electron-donating aldehydes was carried out by using a catalytic amount of TCT (10 mol %) in DMSO under a nitrogen atmosphe...
متن کاملNorcoclaurine synthase: mechanism of an enantioselective pictet-spengler catalyzing enzyme.
The use of bifunctional catalysts in organic synthesis finds inspiration in the selectivity of enzymatic catalysis which arises from the specific interactions between basic and acidic amino acid residues and the substrate itself in order to stabilize developing charges in the transition state. Many enzymes act as bifunctional catalysts using amino acid residues at the active site as Lewis acids...
متن کاملM ay 2 00 7 Invariants from classical field theory Rafael Dı́az and Lorenzo Leal
We introduce a method that generates invariant functions from classical field theories depending on external parameters. We apply our method to several field theories such as abelian BF , Chern-Simons and 2-dimensional Yang-Mills theory.
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ژورنال
عنوان ژورنال: Devenir
سال: 2021
ISSN: ['2312-7562', '2616-4949']
DOI: https://doi.org/10.21754/devenir.v8i15.1293