Synthesis, Characterization, and Biological Activities of Lanthanide(III) Complexes of β-Diketone Hydrazone Derivatives
作者:W. H. Hegazy、I. H. Al-Motawaa
DOI:10.1080/15533174.2011.591645
日期:2011.10.1
A series of beta-diketone hydrazone derivatives has been synthesized through condensation of beta-diketone with aromatic aldehydes followed by reaction with phenylhydrazine. The structures of the ligands and intermediates are well defined through elemental and spectroscopic analyses. These hydrazones are potential ligands toward lanthanide metal ions. New complexes of trivalent scandium, yttrium, lanthanum, and cerium have been synthesized. The composition of these complexes is discussed on the basis of elemental analyses, infrared (IR) spectroscopy, magnetic moments and thermal analyses. The ligands are supposed to be bidentate with the two-sp2 nitrogen atoms. The prepared (1:1) metal: ligand complexes were screened for antibacterial and antifungal properties and have exhibited potential activity. Scandium(III) complexes are more active toward bacterium, yeast, and fungi.
Me<sub>3</sub>SiCF<sub>2</sub>Br-Self-Assisted Domino Reaction: Catalytic Synthesis of α,α-Difluorocyclopentanones from Methylvinylketones
作者:Jian Chang、Cong Xu、Jie Gao、Fengyun Gao、Dongsheng Zhu、Mang Wang
DOI:10.1021/acs.orglett.7b00611
日期:2017.4.7
in the domino conversion of methylvinylketones into α,α-difluorinated cyclopentanones. Initiated by 5 mol % of nBu4NBr, the multistep reaction occurred in one pot under mild conditions via the in situ formation of silyl dienol ethers, difluorocyclopropanation, thermal vinylcyclopropane–cyclopentene rearrangement, and desilylation. The process takes advantage of the multitasking capability of Me3SiCF2Br
Efficient promiscuous Knoevenagel condensation catalyzed by papain confined in Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> nanoflowers
作者:Jianyun Yu、Xinxin Chen、Min Jiang、Anming Wang、Linlin Yang、Xiaolin Pei、Pengfei Zhang、Stephen Gang Wu
DOI:10.1039/c7ra12940h
日期:——
have been investigated for Knoevenagelcondensation reactions with hNFs as catalyst. At optimal conditions, product yield of the hNFs catalyzed reaction was 1.3 fold higher than that of the free enzyme with benzaldehyde and acetylacetone as substrates. A few aldehydes and methylene compounds have also been used to test the generality and scope of this new enzymatic promiscuity. To sum up, the obtained