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