Beilstein J. Org. Chem.2021,17, 719–729, doi:10.3762/bjoc.17.61
inverseelectron-demandDiels–Aldercycloadditionreactions between a dibenzosuberenone and tetrazines that bear various substituents. The pyridazines were synthesized in high yields by oxidation of dihydropyridazine-appended dibenzosuberenones with PIFA or NO. p-Quinone derivatives of pyridazines were
obtained gave absorbance and emission at long wavelengths.
Keywords: dibenzosuberenone; inverseelectron-demandDiels–Aldercycloadditionreactions; p-quinone methide; polycyclic π-conjugated dihydropyridazines; pyridazines; pyrroles; Inroduction
Dibenzosuberone and dibenzosuberenone derivatives are
functional groups at the 3- and 6-positions of s-tetrazine on inverseelectron-demandDiels–Aldercycloadditionreactions with a dibenzosuberenone (1) and the photophysical properties of dihydropyridazines. The corresponding pyridazines and pyrroles were obtained from dihydropyridazines. Finally, we
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Graphical Abstract
Figure 1:
Structures of dibenzosuberenone 1 and pyridazine and pyrrole derivatives.