Abstract
Consecutive treatment of alkenyl carbene complexes with lithium enolates derived from methyl ketones and iodine leads to functionalized 1,3-butadiene derivatives containing both electron-donating and electron-withdrawing groups. Functionalized bicyclic cyclopentenones are easily available by sequential treatment of dihydropyranyl carbene complexes with lithium enolates, iodine, and catalytic amounts of copper(II) triflate.
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