Domino intramolecular enyne metathesis/cross metathesis approach to the xanthanolides. Enantioselective synthesis of (+)-8-epi-xanthatin
作者:David A. Kummer、Jehrod B. Brenneman、Stephen F. Martin
DOI:10.1016/j.tet.2006.05.019
日期:2006.12
palladium-catalyzed carbonylation reaction to form acrylate 34. Compound 34 was then subjected to a deprotection/lactonization sequence to furnish enyne 21, which underwent a domino enyne ring-closing metathesis/crossmetathesis process to form a seven-membered carbocycle and (E)-conjugated dienone, thereby completing the synthesis of 1. This domino ruthenium-catalyzedmetathesis reaction thus serves as an efficient
High π-Facial and <i>exo</i>-Selectivity for the Intramolecular Diels–Alder Cycloaddition of Dodeca-3,9,11-trien-5-one Precursors to 2-<i>epi</i>-Symbioimine and Related Compounds
作者:Ming Xiang、Yiwei Wu、Jason P. Burke、Jason J. Chruma
DOI:10.1021/acs.joc.6b01677
日期:2016.9.16
An unconstrained exocyclic stereogenic center and a removable trimethylsilyl group are combined to induce high π-facial selectivity and near-exclusive exo-selectivity in the intramolecular Diels–Alder cycloaddition of dodeca-3,9,11-trien-5-ones. This strategy provides direct access to polysubstituted trans-1-decalones related to the symbioimines in good yield and acceptable diastereoselectivity.