Yb modified NaY zeolite: A recyclable and efficient catalyst for quinoxaline synthesis

In this study, Yb immobilized NaY zeolite catalyst（Yb/NaY） was obtained by a hydrothermal method and characterized by XRD, BET, FT-IR, ICP-AES, and NH3-TPD. The catalyst displayed good catalytic activity when applied to the synthesis of quinoxalines via condensation of a-hydroxyketones with 1,2-diamines,and could be reused several times without any loss of catalytic activity.

Yttrium-catalyzed heterocyclic formation via aerobic oxygenation:A green approach to benzothiazoles

The YCl3-catalyzed aerobic oxidative cyclization reaction for the synthesis of benzothiazoles has been developed. This method provides a practical, effective and green synthetic approach to benzothiazoles which are important units in many biologically active compounds.

Y(OTf)_3-catalyzed heterocyclic formation via aerobic oxygenation:An approach to dihydro quinazolinones and quinazolinones

The Y（OTf）3-catalyzed aerobic oxidative cyclization reaction for the selective synthesis of dihydroqui- nazolinones and quinazolinones has been developed. This method provides a practical, effective and green synthetic approach to dihydroquinazolinones and quinazolinones which both are important units in many biologically active compounds.

Magnetically recyclable copper modified GO/Fe_3O_4 catalyst for efficient synthesis of quinazolinones

A series of bioactive quinazolinones were effectively synthesized by the condensation of halide benzamide with amino acid using magnetically recyclable GO/Fe3O4–CuI as catalyst. Magnetic GO/Fe3O4–CuI was prepared via a simple chemical method and characterized by FTIR, powder XRD, and SEM.This heterogeneous copper catalyst can be easily separated from reaction mixtures by an external permanent magnet and reused without any obvious loss in activity which shows its applicability as a reusable and promising catalyst for quinazolinones synthesis.