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
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
Studies on Structural Changes and Catalytic Activity of Y-zeolite Composites of 1,3-disulfoimidazolium trifluoroacetate Ionic Liquid (IL) for Three Component Synthesis of 3,4-dihydropyrimidinones
作者:Pinky Gogoi、Arup Kumar Dutta、Ruli Borah
DOI:10.1007/s10562-016-1922-3
日期:2017.3
describes the development of six acidic composites of Y-zeolite with 1,3-disulfoimidazolium trifluoroacetate [Dsim][CF3COO] ionicliquid (IL) and displays the gradual increase of acidic IL mediated dealumination within zeolite framework with increasing loading in Powder XRD and IR studies. The structural changes of modified framework of zeolite were analyzed by SEM-EDX, TEM, TGA, BET and UV–Vis techniques