Synthesis of 3,4-Dihydropyrimidin-2(1<i>H</i>)-ones using Sodium Bisulfate as a Catalyst under Solvent-free Conditions
作者:Min Wang、Ji-Lei Song、Shuang Zhao、Xin Wan
DOI:10.1080/00304948.2014.944407
日期:2014.9.3
the preparation of 5-unsubstituted 3,4-dihydropyrimidin2(1H)-ones via the one-pot condensation of aromatic aldehydes, acetophenones and urea in the presence of NaHSO4 at 90◦C without solvent and promoter (Scheme 1). We initiated our study with 2-nitrobenzaldehyde, acetophenone, and urea as a model reaction to determine the best experimental conditions. Solvent, the amount of catalyst and suitable reaction
Iodotrimethylsilane-Accelerated One-Pot Synthesis of 5-Unsubstituted 3,4-Dihydropyrimidin-2(1H)-ones: A Novel Procedure for theBiginelli-Like Cyclocondensation Reaction at Room Temperature
作者:Gowravaram Sabitha、Kusuma B. Reddy、Rangavajjula Srinivas、Jillu S. Yadav
DOI:10.1002/hlca.200590242
日期:2005.11
A novel Biginelli-like cyclocondensation reaction is efficiently catalyzed by iodotrimethylsilane (Me3SiI) in MeCN. The reaction proceeds at room temperature by a three-component one-pot condensation of ketones with aldehydes and urea to afford 5-unsubstituted 3,4-dihydropyrimidin-2(1H)-ones in good yields (Scheme 1 and Table).
Green Biginelli-type Reaction: Solvent-free Synthesis of 5-unsubstituted 3,4-dihydropyrimdin-2(1<i>H</i>)-ones
作者:Min Wang、Jilei Song、Qilin Lu、Qinglin Wang
DOI:10.1002/jhet.2279
日期:2015.11
The Biginelli‐type compounds, 5‐unsubstituted 3,4‐dihydropyrimdin‐2(1H)‐ones were synthesized by a one‐pot three‐component condensation of aromatic aldehydes, aromatic ketones and urea in the presence of SnCl4 · 5H2O under solvent‐free conditions. The advantages of this method are short reaction time (4–10 min), excellent yields (74–97%), inexpensive catalyst and solvent‐free conditions. A plausible
Capto-Dative Stabilization by Thermal Oxidation of 2-Oxo-1,2,3,4-tetrahydropyrimidines
作者:Hamid R. Memarian、Esmael Sanchooli、Hadi Amiri Rudbari、Giuseppe Bruno
DOI:10.1071/ch16101
日期:——
of a radical, a capto-dative stabilized radical intermediate, among two possible formed double benzylic/allylic radical centres, governs the type of product formed. Whereas the electron-donating nature of the additional methoxy-substituent enhances the rate of oxidation, its attachment to the radical intermediate decreases the radical stability, simultaneously causing the shift of the radical centre