Direct catalytic asymmetric cross-aldol reactions in ionic liquid media
作者:Armando Córdova
DOI:10.1016/j.tetlet.2004.03.080
日期:2004.5
Enantioselective proline-catalyzed direct asymmetric cross-aldol reactions with aldehydes were performed in ionicliquid 1-n-butyl-3-methylimidazolium hexafluorophosphate media, which simplified product isolation and catalyst recycling, affording 3-hydroxy aldehydes in high yield with excellent stereoselectivity. In addition, the enhanced reactivity of the asymmetric cross-aldol reactions in ionic
reactions enabled the asymmetric synthesis of deoxysugars with >99 % ee. In addition, the direct amino acid catalyzed C(2)+C(2)+C(2) methodology is a new entry for the short, highly enantioselective denovosynthesis of carbohydrate derivatives, isotope-labeled sugars, and polyketide natural products. The one-pot asymmetric denovo syntheses of deoxy and polyketide carbohydrates involved a novel dynamic kinetic
Synthesis and biological evaluation of simplified pironetin analogues with modifications in the side chain and the lactone ring
作者:Steven Roldán、Adrià Cardona、Laura Conesa、Juan Murga、Eva Falomir、Miguel Carda、J. Alberto Marco
DOI:10.1039/c6ob01585a
日期:——
mainly in the nature of the sidechain and the lactone ring. Their cytotoxic activity has been measured. In addition, their interaction with tubulin, their ability to inhibit the secretion of the vascular endothelial growth factor (VEGF) and the expression of angiogenesis and telomerase-related genes have been determined. Unexpectedly, and unlike pironetin, the lactones studied in this work do not
Amino acid-catalyzed dynamic kinetic asymmetric transformations (DYKAT): one-step de novo synthesis of polyketide sugars from racemic β-hydroxy aldehydes
作者:Efraim Reyes、Armando Córdova
DOI:10.1016/j.tetlet.2005.08.001
日期:2005.9
The ability of amino acids to catalyze dynamic kinetic asymmetric transformation (DYKAT) with excellent stereoselectivity is presented. The novel DYKAT process was applied in the proline-catalyzed one-step de novo synthesis of triketide- and deoxysugars, which were formed with excellent diastereoselectivity and up to 99% ee. The de novo synthesis is accomplished via an enzyme-like DYKAT process, which