Palladium functionalized phosphinite polyethyleneimine grafted magnetic silica nanoparticles as an efficient catalyst for the synthesis of isoquinolino[1,2-<i>b</i>]quinazolin-8-ones
In this paper, a novel methodology is introduced for the synthesis of novel 5-methyl-8H-isoquinolino[1,2-b]quinazolin-8-one derivatives based on an efficient immobilized palladium catalyzed intramolecular carbon–carbon bond formation. The novel catalyst is fabricated by immobilization of Pd on phosphinite polyethyleneimine functionalized Fe3O4@SiO2 core–shell nanoparticles (denoted as Pd@OPPh2–PEI–mSiO2