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The reaction of alkynyl Fischer carbenes an
d isobenzofurans gives rise to the correspon
ding [4 + 2] cycloa
dducts. The newly forme
d carbenea
dducts are suitable for benzannulation processes in the presence of
tert-butylisocyani
de or carbon monoxi
de to yiel
d a variety of new highlysubstitute
d polycyclic structures having the anthraquinone framework. The whole two-step process is con
ducte
d in a one-pot fashion fromeasily available 1,4-
dihy
dro-1,4-epoxynaphthalenes.