Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2007, Issue 23, Pages 3783-3800Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.200700092
Keywords
epoxyquinols A, B, C; epoxytwinol A; total synthesis; electrocyclic reactions; Diels-Alder reactions; density functional calculations
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The asymmetric total synthesis of epoxyquinols A, B, and C and epoxytwinol A, and computational analysis of the key biomimetic oxidative dimerization procedure are described. In the first-generation synthesis, a HfCl4-mediated diastereo-selective Diels-Alder reaction of furan with Corey's chiral auxiliary has been developed. In the second-generation synthesis, a chromatography-free preparation of an iodolactone using acryloyl chloride as the dienophile in the Diels-Alder reaction of furan and a lipase-mediated kinetic resolution of a cyclohexenol derivative have been developed. This second-generation synthesis is suitable for large-scale synthesis, A biomimetic cascade reaction involving oxidation, 6 pi-electrocyclization, and then Diels-Alder dimerization is the key reaction in the formation of the complex heptacyclic structure of epoxyquinols A, B, and C. Epoxytwinol A is synthesized by the cascade reaction involving oxidation, 6 pi-electrocyclization, and formal [4+4] cycloaddition reactions. A 2H-pyran, generated by oxidation/6 pi-electrocyclization, acts as a good diene, reacting with several dienophiles to afford polycyclic compounds in one step. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007).
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