Video Experimental Relacionado
Updated: Jul 2, 2026
09:28
One-step Metabolomics: Carbohydrates, Organic and Amino Acids Quantified in a Single Procedure
Published on: June 26, 2010
La primera síntesis total de nakadomarina A fue lograda
Toshiaki Nagata1, Masako Nakagawa, Atsushi Nishida
1Graduate School of Pharmaceutical Sciences, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
Journal of the American Chemical Society
|June 19, 2003
Resumen
Los investigadores lograron la primera síntesis total de (+) -nakadomarin A, un alcaloide marino de la manzamina. Esta síntesis confirmó la estructura y la configuración absoluta de este producto natural hexacíclico único.
Área de la Ciencia:
- Química de los productos naturales del mar química de los productos naturales del mar.
- La síntesis orgánica es la síntesis orgánica.
- La estereoquímica es la estereoquímica.
Sus antecedentes:
- La (-) -nadomarina A es un alcaloide manzamina derivado de las esponjas marinas.
- Posee una estructura molecular hexacíclica distintiva.
- Comprender su estereoquímica es crucial para los estudios de actividad biológica.
Objetivo del estudio:
- Para lograr la primera síntesis total de (+) -nakadomarin A, el enantiómero del producto natural.
- Para confirmar la estructura propuesta y la configuración absoluta de la nakadomarina A.
- Desarrollar una ruta sintética para acceder a los derivados alcaloides de la manzamina.
Principales métodos:
- Síntesis estereoselectiva que utiliza un derivado de ácido 4-oxopiperidin-3-carboxílico definido estereocímicamente.
- Síntesis orgánica de varios pasos que involucra formaciones de enlaces clave y transformaciones de grupos funcionales.
- Análisis espectroscópico (NMR, MS) y cromatografía quiral para elucidación estructural y estereoquímica.
Principales resultados:
- Finalización con éxito de la primera síntesis total de (+) -nakadomarin A.
- Confirmación de la estructura hexacíclica y la configuración absoluta de la nakadomarina A.
- Demostración de una estrategia sintética viable para los alcaloides complejos de manzamina.
Conclusiones:
- La síntesis total proporciona una prueba inequívoca de la estructura y la configuración absoluta de la nakadomarina A.
- Este logro sintético abre caminos para la preparación de análogos y una mayor investigación biológica.
- La metodología desarrollada puede aplicarse a la síntesis de otros alcaloides de manzamina.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:27C4 Pathway and CAM
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
01:19MALDI-TOF Mass Spectrometry
Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
01:21Tandem Mass Spectrometry
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
01:08Matrix-Assisted Laser Desorption Ionization (MALDI)
Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
01:12First Pass Effect
Presystemic elimination, or the first-pass effect, is the metabolism of drugs that reduces their effective concentration at the site of action. Apart from the first-pass effect, the systemic bioavailability of the drug is also reduced by other factors, including incomplete absorption or chemical degradation of drugs.
Depending on the route of administration, drugs can be metabolized in the liver, intestine, lungs, and vasculature. Orally administered drugs are first absorbed through the...
Depending on the route of administration, drugs can be metabolized in the liver, intestine, lungs, and vasculature. Orally administered drugs are first absorbed through the...
01:22Consecutive Reactions
Consecutive reactions involve a sequence where the product of a preceding reaction becomes the reactant for the subsequent one. In a simple scheme, A transforms into B, which further reacts to form C, with rate constants k1 and k2, respectively. This concept is evident in the radioactive decay series. Assuming an initial state with only A present, the conservation of matter leads to three coupled differential equations, determining the concentrations of A, B, and C over time.The rate of change...