A new In–SiO2 composite catalyst in the solvent-free multicomponent synthesis of Ca2+ channel blockers nifedipine and nemadipine B
作者:Ricardo F. Affeldt、Edilson V. Benvenutti、Dennis Russowsky
DOI:10.1039/c2nj40060j
日期:——
An InâSiO2 composite was prepared by the solâgel method and was applied as a heterogeneous Lewis acid catalyst in the multicomponent Hantzsch synthesis of symmetrical and non-symmetrical 1,4-DHPs. The Ca2+ channel blockers nifedipine and nemadipine B were synthesized in a single step through a solvent-free protocol.
Ceric Ammonium Nitrate (CAN) catalyzes the one-pot synthesis of polyhydroquinoline via the Hantzsch reaction
作者:Shengkai Ko、Ching-Fa Yao
DOI:10.1016/j.tet.2006.05.037
日期:2006.7
A facile and efficient one-pot synthesis of high yields of polyhydroquinoline derivatives at ambient temperature using Ceric Ammonium Nitrate (CAN) as catalyst via the Hantzschreaction was reported. The process is simple and environmentally benign and the catalyst is commercially available and inexpensive.
Combined Thiourea Dioxide–Water: An Effective Reusable Catalyst for the Synthesis of Polyhydroquinolines via Hantzsch Multicomponent Coupling
作者:Neeraj Kumar、Sanny Verma、Suman L. Jain
DOI:10.1246/cl.2012.920
日期:2012.9.5
Thiourea dioxide in water was found to be an efficient and reusable organocatalytic system for the one-pot synthesis of polyhydroquinoline derivatives via the Hantzsch-type coupling of aldehyde, dimedone, acetoacetate, and ammonium acetate under mild reaction conditions. Operational simplicity, the use of an economically affordable catalyst, environmentally benign conditions, high product yields, and reusability of the catalyst system were the advantageous features of the developed method.
Peng, Hua-Nan; Peng, Xiao-Ming; Zheng, Da-Gui, Asian Journal of Chemistry, 2011, vol. 23, # 4, p. 1833 - 1837
作者:Peng, Hua-Nan、Peng, Xiao-Ming、Zheng, Da-Gui
DOI:——
日期:——
Sucrose chelated auto combustion synthesis of BiFeO
<sub>3</sub>
nanoparticles: Magnetically recoverable catalyst for the one‐pot synthesis of polyhydroquinoline
synthesized materials. The BiFeO3 nanoparticles so obtained were employed as heterogeneouscatalyst for the synthesis of polyhydroquinolinederivatives. All the polyhydroquinolinederivatives were characterized by Fourier transform infrared spectroscopy (FT‐IR) and Nuclear magnetic resonance spectroscopy (1H NMR). For the very first time ever we have used BiFeO3 as a recyclable magnetic nanocatalyst in the
通过自动燃烧合成了蔗糖螯合的铋铁氧体(BiFeO 3)纳米颗粒作为新型非均相催化剂。已采用不同的煅烧温度(150°C,450°C,550°C,650°C,750°C和850°C)获得单相BiFeO 3纳米粒子。钙钛矿结构的形成和有机相(蔗糖)的消失是通过傅立叶变换红外光谱(FT-IR)获得的。相的确定和结构表征是通过粉末X射线衍射(XRD)进行的。通过振动样品磁力计(VSM)分析了磁性,而表面积/孔体积是通过Brunauer-Emmett-Teller(BET)获得的。透射电子显微镜(TEM)分析了颗粒的大小和形态。通过热重分析(TGA)研究热稳定性,并通过X射线光电子能谱(XPS)确定组成元素。拉曼光谱证实了合成材料的钙钛矿结构。BiFeO 3如此获得的纳米颗粒用作合成多氢喹啉衍生物的非均相催化剂。所有聚氢喹啉衍生物均通过傅里叶变换红外光谱(FT-IR)和核磁共振光谱(1 H NMR)进