Abstract

Cycloadditions of 1-(dimethylamino)-4-methyl-1-azabuta-1,3-diene to naphtoquinones afford after elimination of dimethylamine the 1,4-dihydro aza-anthraquinones 4 . A high regioselectivity is observed with juglone and methyljuglone. Aromatization of compounds 4 leads to the corresponding aza-anthraquinones 6 .

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