کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
41235 | 45882 | 2011 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Silica bonded n-propyl-4-aza-1-azoniabicyclo[2.2.2]octane chloride (SB-DABCO): A highly efficient, reusable and new heterogeneous catalyst for the synthesis of 4H-benzo[b]pyran derivatives Silica bonded n-propyl-4-aza-1-azoniabicyclo[2.2.2]octane chloride (SB-DABCO): A highly efficient, reusable and new heterogeneous catalyst for the synthesis of 4H-benzo[b]pyran derivatives](/preview/png/41235.png)
The reaction of 3-chloropropyl silica with diazabicyclo[2.2.2]octane in dry acetone affords silica bonded n-propyl-4-aza-1-azoniabicyclo[2.2.2]octane chloride (SB-DABCO) as a new basic catalyst. The catalyst is used for the efficient synthesis of 4H-benzo[b]pyran derivatives via one-pot three-component reaction of cyclic ketones/1,3-diketones with aromatic aldehydes and alkylmalonates.
Figure optionsDownload high-quality image (171 K)Download as PowerPoint slideHighlights
► Introducing a new catalyst for organic transformations.
► Introducing an efficient new method for synthesis of 2-amino-4H-benzo[b]pyrans.
► Superiority of the catalyst in comparison with the reported catalysts.
► Generality and simplicity of the method, high yields and short reaction times.
► Environmental compatibility, non-toxicity, low cost and recoverability of the catalyst.
Journal: Applied Catalysis A: General - Volume 402, Issues 1–2, 31 July 2011, Pages 11–22