C. Jolivet et al., REACTION OF ORTHO-LITHIATED PROTECTED ANILINES WITH O-HYDROXYCARBONYLCOMPOUNDS - FORMATION OF QUINO-ACRIDINES AND PYRANOQUINO-ACRIDINES, Journal of the Chemical Society. Perkin transactions. I, (18), 1995, pp. 2333-2337
Reaction of N-tert-butoxycarbonyl-2-lithioaniline and p-anisidine with
1-hydroxy-3-methoxy-10-methylacridone and noracronycine gave quino[2,
3,4-kl]acridines and pyrano[3,2-b]quino[4,3,2-mn]acridines respectivel
y, which are related to biologically active compounds recently isolate
d from various marine animals.