کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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690631 | 1460418 | 2015 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: One-pot synthesis of annulated pyrido[2,3-d:6,5-d]dipyrimidine derivatives using nitrogen based DBU catalyst in aqueous ethanol medium One-pot synthesis of annulated pyrido[2,3-d:6,5-d]dipyrimidine derivatives using nitrogen based DBU catalyst in aqueous ethanol medium](/preview/png/690631.png)
• One-pot synthesis of annulated pyrido[2,3-d:6,5-d]dipyrimidine derivatives.
• DBU as an efficient catalyst for synthesis of annulated pyrimidine derivatives.
• The advantages of this process are mild reaction conditions and excellent yields (72–89%).
We have reported DBU as an efficient organocatalyst for one-pot three-component synthesis of annulated pyrido[2,3-d:6,5-d]dipyrimidine derivatives using aromatic aldehyde, thio-barbituric acid and 6-amino-uracil in aqueous ethanol under reflux. The attractive advantages of this process are mild reaction conditions, environment friendly procedure, short reaction times, easy isolation of products, and excellent yields (72–89%).
This paper reported the synthesis of pyrido[2,3-d]pyrimidine derivatives via initial Knoevenagel, subsequent addition and final heterocyclization of substituted aromatic aldehydes, thio-barbituric acid and 6-aminouracil in aqueous ethanol as solvent using DBU as new organocatalyst catalyst. The results showed that a series of aromatic aldehydes were effectively used to prepare the targeted pyrido[2,3-d:6,5-d]dipyrimidine derivatives with good to excellent yields (72–89%) and there is no major effect on the yield of product by electron donating/withdrawing substituents.Figure optionsDownload as PowerPoint slide
Journal: Journal of the Taiwan Institute of Chemical Engineers - Volume 56, November 2015, Pages 191–195