Highly enantioselective synthesis of Warfarin and its analogs catalysed by primary amine–phosphinamide bifunctional catalysts
作者:Juan Dong、Da-Ming Du
DOI:10.1039/c2ob26334c
日期:——
An efficient enantioselective Michael addition of 4-hydroxycoumarin to α,β-unsaturated ketones catalysed by primary amine–phosphinamide bifunctionalcatalysts has been developed. This reaction afforded Warfarin and its analogs in moderate to excellent yields (up to 99%) and good to excellent enantioselectivities (up to 99% ee).
quinolinic acid (QUIN) was studied for the synthesis of spirochromene and pyranopyrazole derivatives from readily available materials. The salient features of these one‐pot multicomponent protocols are the clean reaction profile, easy isolation of products, no chromatographic separation techniques, high efficiency, short reaction time, and high yield of products plus using QUIN as a new, inexpensive, commercially
Synthesis, characterization, and application of CoFe
<sub>2</sub>
O
<sub>4</sub>
@amino‐2‐naphthol‐4‐sulfonic acid as a novel and reusable catalyst for the synthesis of spirochromene derivatives
In the present work, 1‐amino‐2‐naphthol‐4‐sulfonicacid immobilized on functionalized CoFe2O4 nanoparticles was successfully synthesized as a new, efficient, and recoverable catalyst and tested for the synthesis of spirochromene derivatives by a simple, green, and inexpensive procedure. This magnetically heterogeneous nanocatalyst was characterized by various techniques such as Fourier transform infrared
在目前的工作中,将1-氨基-2-萘酚-4-磺酸固定在功能化的CoFe 2 O 4上纳米颗粒已成功地合成为新型,高效且可回收的催化剂,并通过简单,绿色和廉价的方法测试了螺环色素衍生物的合成。这种磁性非均相纳米催化剂的特征在于多种技术,例如傅立叶变换红外(FT-IR),热重分析(TGA)/导数热重分析(DTG),X射线衍射(XRD),MAP,透射电子显微镜(TEM),能量色散X射线光谱(EDS),振动样品磁力计(VSM),Brunauer-Emmett-Teller(BET)和扫描电子显微镜(SEM)分析。该新型合成的纳米催化剂可以容易地分离并且也可以重复使用几次而其催化活性没有明显损失。此外,与以前的报告相比,
Selective Hydrogenation of Unsaturated Carbon–Carbon Bonds in Aromatic-Containing Platform Molecules
作者:Thomas J. Schwartz、Spencer D. Lyman、Ali Hussain Motagamwala、Max A. Mellmer、James A. Dumesic
DOI:10.1021/acscatal.6b00072
日期:2016.3.4
Each of these products requires the hydrogenation of 4-hydroxycoumarin (4HC) to 4-hydroxydihydrocoumarin (4HDHC), which, in turn, requires the reduction of an unsaturated C–C bond in the presence of an aromatic ring. Using in situ attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, we show that reaction at 348 K over monometallic Pd catalysts leads to the partial reduction of
Spectroscopic evaluation of Zn (II) complexes with drug analogues: Interactions with BSA and the pH effect on the drug-Zn (II) system
作者:Manolis C. Vlasiou、Kyriaki S. Pafiti
DOI:10.1016/j.saa.2020.118641
日期:2020.11
docking, the interactions between the zinccomplexes with drug analogues and bovine serum albumin were investigated. In addition, considering the ubiquitous presence of zincions in the human system, we studied the interactions between this ion with hymecromone, dihydropyridine analogue, and acetamide, as well as the pH influence on these systems. The complexes were synthesized by interaction between the