Table 4 Synthesis of Indazolophthalazinetrione derivatives (7a–l) catalyzed with ZrO2@L-tryptophan at 80 ̊C under solvent-free conditions.

From: Novel L-tryptophan-functionalized zirconium dioxide nanoparticles catalysed one-pot and solvent-free synthesis of 2 H-indazolo [2, 1-b] phthalazine-triones