Formal Intermolecular 4 + 4 Approach to Cyclooctanoids: 4 + 3 Capture of the Nazarov Oxyallyl Intermediate with Simple 1,3-Dienes
作者:Yong Wang、Brenden D. Schill、Atta M. Arif、F. G. West
DOI:10.1021/ol034985b
日期:2003.7.1
[reaction: see text] Simple 1,4-dien-3-ones and 1,3-dienes react in the presence of BF(3).OEt(2) via a domino Nazarov electrocyclization/intermolecular [4 + 3]-cycloaddition sequence to furnish keto-bridged cyclooctenes in good yield. Most cases showed high diastereofacial selectivity and/or endo/exo selectivity, and surprising levels of regioselectivity were observed when isoprene was used as the
Convenient route to centro-substituted triquinacene skeletons via the interrupted Nazarov reaction
作者:Ashantai Yungai、F.G. West
DOI:10.1016/j.tetlet.2004.05.072
日期:2004.7
cation with 2,3-dimethyl-1,3-butadiene are cleaved by ozonolysis to furnish triketones. In the presence of methanolic KOH, these triones undergo tandem aldol additions to furnish centro-hydroxylated triquinacene skeletons.