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Chiral alkenyl carbene complexes of tungsten(0) 1 and 2, readily available from the chiral pool, undergo the [4+2] cycloaddition with the Danishefsky diene to provide enantiopure 4-alkenyl-2-cyclohexenone adducts 5 and 7 with high stereoselectivity after treatment of the primary cycloadducts 4 and 6 with TBAF. Cyclopentadiene also cycloadds to carbenes 1 and 2 affording the expected norbornene metal...
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