An efficient synthesis of 4,5-diaryl-3,4-dihydropyrimidin-2(1<i>H</i>)-one <i>via</i> a cesium carbonate-promoted direct condensation of 1-aryl-2-propanone with 1,1′-(arylmethylene)diurea
An efficient method for the synthesis of 4,5-diaryl-3,4-dihydropyrimidin-2(1H)-one by using 1,1′-(arylmethylene)diurea and 1-aryl-2-propanone as substrates was developed. The reactions proceeded efficiently in the presence of Cs2CO3 to give the desired products in moderate to good yields with wide substrate scope and good functional group tolerance, serving as an attractive alternative or complement
开发了一种以1,1'-(芳基亚甲基)二脲和1-芳基-2-丙酮为底物合成4,5-二芳基-3,4-二氢嘧啶-2(1 H )-酮的有效方法。反应在 Cs 2 CO 3存在下有效进行,以中等至良好的产率得到所需的产物,具有广泛的底物范围和良好的官能团耐受性,可作为先前报道的简便组装生物学方法的有吸引力的替代或补充。和具有药学活性的 3,4-二氢嘧啶-2(1 H )-酮。
10.33224/rrch.2019.64.7.05
作者:Mahajan, Hitesh、Jamwal, Babita、Paul, Satya
DOI:10.33224/rrch.2019.64.7.05
日期:——
Eco-efficiency and scalable synthesis of bisamides in deep eutectic solvent
作者:Najmedin Azizi、Masoumeh Alipour
DOI:10.1016/j.molliq.2015.02.033
日期:2015.6
Solvents define a major part of the environmental performance of processes in chemical industry and also impact on cost, safety and health issues. In order to minimize the environmental impact resulting from the use of volatile organic solvents in chemical production, a deep eutectic solvent (DES) consisting of choline chloride and urea (1:2 molar ratio) was prepared and used as the co-solvent for the preparation of gem-bisamides starting from aldehydes. The deep eutectic solvent fulfills the triple role of being a solvent, as a catalyst and as reagents, and provides a green, safe and cost-effective access to various gem-bisamides without a tedious work-up. The desired compounds were obtained in a few mm (15-120 min) with moderate to good yields (52-90%) and amenable to large scale production without significant loss in its efficiency. (C) 2015 Elsevier B.V. All rights reserved.
Schiff, Justus Liebigs Annalen der Chemie, 1869, vol. 151, p. 203