Total synthesis of (15R)- and (15S)-F(2t)-isoprostanes by a biomimetic process using the cyclization of acyclic dihydroxylated octa-5,7-dienyl radicals |
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Authors: | Durand Thierry Guy Alexandre Vidal Jean-Pierre Rossi Jean-Claude |
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Affiliation: | Laboratoire de Chimie Biomoléculaire et Interactions Biologiques, associée au CNRS (UMR 5074), and Université Montpellier I, Faculté de Pharmacie, 15 Av. Charles Flahault, B.P. 14 491, F-34093 Montpellier Cedex 5, France. |
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Abstract: | We report a new route to F(2t)-IsoP (formerly named 8-epi-PGF(2alpha)) using a biomimetic radical cyclization of a highly functionalized C20 precursor. The strategy employed gives a beta-hydroxy free radical followed by molecular oxygen trapping, which is an unusual method for quenching carbon free radicals. We observed the formation of unique diastereoisomers (15R)- and (15S)-F(2t)-IsoP. This result is consistent with a strong stereoelectronic control associated with a steric effect initiated by the side chains alpha and omega on the cyclopentane ring. |
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