The regiospecific substitution of isomeric halogenoquinones by the app
ropriate sulfonamide can be carried in the presence of fluoride ions a
nd affords the corresponding o-methoxycarbonylanilinoquinones of defin
ite structure. After reductive methylation, saponification and cycliza
tion, these substrates provide ready access to highly substituted acri
dones and benz[b]acridones some of which are difficultly obtained by o
ther means.