A new Ce-Schiff base complex on modified KIT-۶ as a reusablenanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans and sulfoxides

In this work, KIT-۶@Schiff-base@Ce was synthesized and identified using differenttechniques including BET, FT-IR, WDX, SEM, EDX, and TGA. KIT-۶@Schiff-base@Ce wasfound to be a novel and recyclable catalyst for the synthesis of sulfoxide andtetrahydrobenzo[b]pyran derivatives. Conversion of organosulfur compounds such as sulfides intosulfoxides is a topic of interest in several chemical areas, due to their applications in biological,medical, synthetic and petroleum industry. For example, pantoprazole, omeprazole, lansoprazoleand pesticide fipronil are typical examples of the pharmaceutically important sulfoxide derivativesin pharmaceutical and fine chemical industries [۱]. Tetrahydrobenzo[b]pyrans have belonged tothe class of oxygen-containing heterocycle compounds which can be used in the biological andpharmaceutical fields. They have possessed significant attention in the biological properties suchas spasmolytic, diuretic, anticoagulant, anticancer, antianaphylactic, antitumor, antifungal,antiallergic, antibacterial,antileishmanial, hypotensive, antiviral and insulin-sensitizing activity[۲,۳]. These compounds are synthesized from the condensation of aldehydes, malononitrile, anddimedone in the presence of various catalysts [۴].

Keywords:

Mesoporous KIT-۶ , nanocatalyst , cerium , sulfoxides , tetrahydrobenzo[b]pyrans