Abstract
Two quaternary carbon centers are created in the title reaction to form fused dihydropyrans (see scheme). The same catalyst promotes the ortho functionalization of aryl ketones with 1,6-enynes with excellent regio- and enantioselectivity. Z=amide, C(CO2Me)2, O; E=CO2Et, Ac; R1=Me, aryl, CO2Me; R2=Me; R3=Me, CO2Et. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z704758_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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