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Title
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Phosphonic acid tagged carbon quantum dots encapsulated in SBA‑15 as a novel catalyst for the preparation of N‑heterocycles with pyrazolo, barbituric acid and indole moieties
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Type
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JournalPaper
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Keywords
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Phosphonic acid carbon quantum dots
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Abstract
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Herein, we have presented a new insight for the synthesis of a hybrid heterogeneous catalyst. For this purpose, phosphonic acid tagged carbon quantum dots of CQDs-N(CH2PO3H2)2 encapsulated and assembled in channels of SBA-15 using a post-modifcation strategy. The mesoporous catalyst of functionalized carbon quantum dots (CQDs) was characterized by several techniques. CQDs-N(CH2PO3H2)2/SBA-15 as an excellent catalyst was applied for the preparation of novel pyrazolo[4′,3′:5,6]pyrido[2,3-d]pyrimidine derivatives by using pyrazole, barbituric acid and indole moieties at 100 °C under the solvent-free condition. The present work shows that a signifcant increase in the catalytic activity can be achieved by a rational design of mesoporous SBA-15 modifed with CQDs for the synthesis of biological active candidates. The synthesized compounds did not convert to their corresponding pyridines via an anomeric-based oxidation mechanism.
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Researchers
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Sadegh Rostamnia (Fifth Researcher), ma z (Fourth Researcher), (Third Researcher), Hassan Sepehrmansourie (Second Researcher), (First Researcher)
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