4H-benzochromene derivatives catalyzed by KCC-1@SO3H nano heterogeneous solid acid
محل انتشار: بیستمین کنگره شیمی ایران
سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 381
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شناسه ملی سند علمی:
IRANCC20_703
تاریخ نمایه سازی: 28 اردیبهشت 1398
چکیده مقاله:
During the last decade, 4H-benzochromene derivatives have received great attention in organic chemistry due to their biological and pharmaceutical properties such asantimicrobial, antiviral, sex pheromone, antitumor, anti-inflammatory, anti-tubercular, and cancer therapy [1]. These compounds were synthesized via multicomponentreaction of aromatic aldehyde with malononitrile and β-naphthol in the presence of various Bronsted and Lewis acids such as methane sulphonic acid, TiCl4, H14 [NaP5W30O110], p-TSA, as well as basic catalysts such as g-alumina, Na2CO3, K2CO3, piperidine, nano sized MgO and NaOH. To overcome some drawbacks like the recovery of catalysts and promote the catalytic efficiency, Bronsted acids are supported on solid material producing heterogeneous solid acid. A KCC-1 silica nanosphere with high surface area, which comes from its fibrous morphology, is an excellent nominee to utilize as a support to design efficient heterogeneous nanocatalysts that would satisfy these conditions [3]. In this study, 4Hbenzochromene derivatives were synthesized by multicomponent reaction of aromatic aldehyde with malononitrile and β-naphthol in the presence KCC-1@SO3H in water media at reflux conditions. The results showed that the corresponding products were obtained in excellent yields (90-95%)(fig. 1). The catalyst was reused for several times without lack of activity.
نویسندگان
Atefeh zeinali,
Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran.
Ali allahresani
Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran.