SYNTHESIS OF METHYL-DERIVATIVES OF NEW POLYCYCLIC SYSTEMS OF 4H-FURO[3,2-G]PYRROLO[3,2,1-IJ]QUINOLIN-4-ONE, OF 1H,5H-BENZOFURO[5,6,7-IJ]QUINOLIZIN-5-ONE AND 3H,5H-BENZOFURO[5,6,7-IJ]QUINOLIZIN-5-ONE
P. Rodighiero et al., SYNTHESIS OF METHYL-DERIVATIVES OF NEW POLYCYCLIC SYSTEMS OF 4H-FURO[3,2-G]PYRROLO[3,2,1-IJ]QUINOLIN-4-ONE, OF 1H,5H-BENZOFURO[5,6,7-IJ]QUINOLIZIN-5-ONE AND 3H,5H-BENZOFURO[5,6,7-IJ]QUINOLIZIN-5-ONE, Journal of heterocyclic chemistry, 30(3), 1993, pp. 715-722
The synthesis of new tetracyclic 4H-furo[3,2-g]pyrrolo[3,2,1-ij]quinol
in-4-ones, 15-17, 1H,5H-benzofuro[5,6, 7-ij]quinolizin-5-ones, 18-20,
and 3H,5H-benzofuro[5,6,7-ij]quinolizin-5-ones, 21-23 is described. Th
e planarity of the structure of benzofuroquinolizin-5-one 18 was deter
mined by X-ray single-crystal analysis.