Formal Total Synthesis of Okadaic Acid via Regiocontrolled Gold(I)-Catalyzed Spiroketalizations
作者:Chao Fang、Yucheng Pang、Craig J. Forsyth
DOI:10.1021/ol101833h
日期:2010.10.15
Both C19 and C34 spiroketal domains of okadaicacid were assembled using gold(I) chloride catalyzed spiroketalizations, and the two resulting fragments were coupled to give the C15−C38 fragment of okadaicacid, a known intermediate for the totalsynthesis of this important natural product.
Toward the Elucidation of the Metabolism of 15-E<sub>2</sub>-Isoprostane: The Total Synthesis of the Methyl Ester of a Potential Central Metabolite
作者:Ullrich Jahn、Emanuela Dinca
DOI:10.1021/jo1006569
日期:2010.7.2
An 11-step total synthesis of the methyl ester of a potential metabolite of the autoxidatively formed natural product 15-E2-IsoP, whose metabolism is not known, is reported. Several vinylogous Mukaiyama aldol additions were tested for the assembly of the acyclic C7−C20 precursor. A new oxidative dianion cyclization served to access the cyclopentane core. The full carbon skeleton was synthesized by