Cobalt-based metal coordination polymers with 4,4′-bipyridinyl groups: highly efficient catalysis for one-pot synthesis of 3,4-dihydropyrimidin-2(1H)-ones under solvent-free conditions
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- 作者：Jin-Hua Wang ; Gui-Mei Tang ; Shi-Chen Yan ; Yong-Tao Wang ; Shi-Jie Zhan ; E Zhang ; Yu Sun ; Yuan Jiang and Yue-Zhi Cui
- 刊名：Applied Organometallic Chemistry
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：30
- 期：12
- 页码：1009-1021
- 全文大小：895K
- ISSN：1099-0739
文摘
Three new metal coordination complexes, namely [Co(BPY)2(H2O)2](BPY)(BS)2(H2O)4 (), [Co(BPY)2(H2O)4](ABS)2(H2O)2 () and [Co(BPY)(H2O)4](MBS)2 () (BPY = 4,4′-bipyridine, BS = phenylsulfonic acid, ABS = p-aminobenzenesulfonic acid, MBS = p-methylbenzenesulfonic acid), were obtained under hydrothermal conditions. Complexes were structurally characterized using single-crystal X-ray diffraction and infrared spectroscopy. All of them display low-dimensional motifs: complex displays a two-dimensional structure; and complexes and exhibit a one-dimensional tape structure. Through strong intermolecular hydrogen bonding interactions and weak packing interactions, all of them further stack to generate a three-dimensional supramolecular architecture. Catalysts were involved in the green synthesis of a variety of 3,4-dihydropyrimidin-2(1H)-ones under solvent-free conditions through Biginelli reactions. The corresponding catalytic product was obtained in quantitative yields (99%) under eco-friendly synthesis conditions for the variety of reactions. Catalysts exhibit excellent efficiency for the desired product, and their catalytic performance shows the following order: > ≈ , which can be ascribed to the hydrophobic interactions of different phenylsulfonate groups. The catalytic performance for the Biginelli reaction is not only dependent on the selected solvents, but also inversely proportional to the polarities of the solvents. Copyright