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- W2044717811 abstract "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." @default.
- W2044717811 created "2016-06-24" @default.
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- W2044717811 date "2012-11-01" @default.
- W2044717811 modified "2023-09-27" @default.
- W2044717811 title "Silica-Bonded N-Propylpiperazine Sodium n-Propionate as Recyclable Basic Catalyst for Synthesis of 3,4-Dihydropyrano[c]chromene Derivatives and Biscoumarins" @default.
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- W2044717811 doi "https://doi.org/10.1016/s1872-2067(11)60457-9" @default.
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