SEMINARIO QUÍMICA ORGÁNICA 20-4-26 EXPOSITOR : Dr. Ernesto G. Mata TÍTULO : " Total Syntheses of Bryostatins ". FUENTE : Guo, Q., Yang, Y., Zhang, H., Wang, D., Li, B., Jiang, D., ... & Song, Z. Angewandte Chemie , 2025 , 137 (14), e202423465. DÍA, HORA y LUGAR : Lunes 20 de abril de 2026, 14:00 h, Aula de graduados y virtual. Modalidad virtual, Link : meet.google.com/wpi-ujuz-rok. Resumen : Bryostatin 1 34, produced by a bacterial symbiont of the marine bryozoan Begula neritina, has shown promise for the treatment of Alzheimer’s disease. This work reports the divergent total syntheses of bryostatins, obtaining 1.5 g of bryostatin 1 in the final three steps. Key methods include Ni-catalyzed reductive cross-coupling, flow-assisted light-induced radical addition, and a Prins cyclization for cis-Z selectivity. The syntheses require 20–22 linear steps (33–35 total) with overall yields of 3.3–4.5%.
SEMINARIO QUÍMICA ORGÁNICA 13-4-26 EXPOSITOR : Lic. Darián Vazquez TÍTULO : " Total syntheses of Tetrodotoxin and 9-epiTetrodotoxin ". FUENTE : Chen, P., Wang, J., Zhang, S. et al. Total syntheses of Tetrodotoxin and 9-epiTetrodotoxin. Nat Commun 15, 679 (2024). https://doi.org/10.1038/s41467-024-45037-0 . DÍA, HORA y LUGAR : Lunes 13 de abril de 2026, 14:00 h, híbrido. Modalidad presencial (Aula de graduados) y virtual, Link : meet.google.com/wpi-ujuz-rok. Resumen : Tetrodotoxin and congeners are specific voltage-gated sodium channel blockers that exhibit remarkable anesthetic and analgesic effects. Here, we present a scalable asymmetric syntheses of Tetrodotoxin and 9-epiTetrodotoxin from the abundant chemical feedstock furfuryl alcohol. The optically pure cyclohexane skeleton is assembled via a stereoselective Diels-Alder reaction. The dense heteroatom substituents are established sequentially by a series of functional group interconversions on highly oxygenated ...