Investigation of the uncommon basic properties of [Ln(W5O18)2]9– (Ln = La, Ce, Nd, Gd, Tb) by changing central lanthanoids in the syntheses of pyrazolopyranopyrimidines
作者:Nahid Lotfian、Majid M. Heravi、Masoud Mirzaei、Mansoureh Daraie
DOI:10.1016/j.molstruc.2019.126953
日期:2020.1
Abstract Five Lindqvist-type lanthanopolyoxometalates ([Ln(W5O18)2]9–, Ln = La, Ce, Nd, Gd, Tb) complexes were prepared and fully characterized. Their basic catalytic activity was manipulated in the successful and high yielding synthesis of a series of pyrazolopyranopyrimidines via a four-component reaction, involving ethyl acetoacetate, hydrazine hydrate, benzaldehydes, and barbituric acid under ultrasonic
摘要 制备并充分表征了五种 Lindqvist 型镧系多金属氧酸盐 ([Ln(W5O18)2]9-, Ln = La, Ce, Nd, Gd, Tb) 配合物。它们的基本催化活性在通过四组分反应(包括乙酰乙酸乙酯、水合肼、苯甲醛和巴比妥酸)在超声波照射下成功和高产合成一系列吡唑并吡喃并嘧啶中得到控制。比较这些催化剂在相同优化反应条件下的催化活性,在所得产物的产率方面,在较短的反应时间内,表明([Tb(W5O18)2]9– - 在上述多组分反应 (MCR) 中。