通过芳香醛和(硫代)的一锅式伪三组分多米诺偶联,已开发出一种有效,安全且简便的途径来官能化螺[furo [2,3- d ]嘧啶-6,5'-嘧啶]衍生物室温下在水中存在乌托品-溴(UB)配合物时的巴比妥酸。该反应顺序由芳族醛与(硫代)巴比妥酸的最初的Knoevenagel缩合组成,然后第二个当量的(硫代)巴比妥酸衍生物的迈克尔加成,然后由UB催化的Williamson环醚化提供产物。
L-Proline based ionic liquid: A highly efficient and homogenous catalyst for synthesis of 5-benzylidene-1,3-dimethylpyrimidine-2,4,6(1H,3H,5H)-trione and pyrano[2,3-d] pyrimidine diones under ultrasonic irradiation
作者:Paresh G. Patil、Yuvraj Satkar、Dhananjay H. More
DOI:10.1080/00397911.2020.1811987
日期:2020.12.16
Abstract A catalytic, practical, efficient procedure for the synthesis of 5-benzylidene-1,3-dimethylpyrimidine-2,4,6(1H,3H,5H)-trione and pyrano[2,3-d] pyrimidine diones at roomtemperature was developed using L-Proline nitrate ionic liquid under ultrasonic irradiation. The L-Proline nitrate is homogeneous and green catalyst easy to prepare by mixing L-Proline and nitric acid possess excellent catalytic
Urotropine–bromine promoted synthesis of functionalized oxaspirotricyclic furopyrimidines via a domino Knoevenagel condensation/Michael addition/α-bromination/Williamson cycloetherification sequence in water
5′-pyrimidine] derivatives has been developed by a one-pot pseudo three-component domino coupling of aromatic aldehydes and (thio)barbituric acids in the presence of urotropine–bromine (UB) complex in water at room temperature. The reaction sequence consists of an initial Knoevenagel condensation of aromatic aldehydes with (thio)barbituric acids, followed by Michael addition of the second equivalent of
通过芳香醛和(硫代)的一锅式伪三组分多米诺偶联,已开发出一种有效,安全且简便的途径来官能化螺[furo [2,3- d ]嘧啶-6,5'-嘧啶]衍生物室温下在水中存在乌托品-溴(UB)配合物时的巴比妥酸。该反应顺序由芳族醛与(硫代)巴比妥酸的最初的Knoevenagel缩合组成,然后第二个当量的(硫代)巴比妥酸衍生物的迈克尔加成,然后由UB催化的Williamson环醚化提供产物。