کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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59212 | 1419460 | 2012 | 10 صفحه PDF | دانلود رایگان |
A simple and efficient procedure for the preparation of silica-bonded N-propylpiperazine sodium n-propionate (SBPPSP) by the hydrolysis of silica-bonded N-propylpiperazine methyl n-propionate (SBPPMP) in hydrochloric acid (0.5 mol/L) followed by treatment with saturated sodium bicarbonate is described. The SBPPMP was obtained by the reaction of 3-silica-bonded N-propylpiperazine and methyl acrylate in methanol. SBPPSP was used as a recyclable basic catalyst for the synthesis of 3,4-dihydropyrano[c]chromenes by the reaction of aromatic aldehydes, malononitrile, and 4-hydroxycoumarin in aqueous ethanol (1:1 v/v) under reflux conditions. Biscoumarins were also obtained via condensation of aldehydes and 4-hydroxycoumarin in aqueous ethanol (1:1 v/v) under reflux conditions. The catalyst could be recycled several times without any additional treatment.
A simple procedure for the preparation of silica-bonded N-propylpiperazine sodium n-propionate is described. This heterogeneous solid base is used as a catalyst for the synthesis of 3,4-dihydropyrano[c]chromenes and biscoumarins in aqueous ethanol (1:1, v/v) under reflux conditions.Figure optionsDownload as PowerPoint slide
Journal: Chinese Journal of Catalysis - Volume 33, Issues 11–12, November–December 2012, Pages 1840–1849