Highly efficient synthesis of 1- and 5-substituted 1H-tetrazoles using chitosan derived magnetic ionic liquid as a recyclable biopolymer-supported catalyst
作者:Ali Khalafi-Nezhad、Somayeh Mohammadi
DOI:10.1039/c3ra23107k
日期:——
A general method for the efficient synthesis of 1- and 5-substituted1H-tetrazoles from nitriles and amines is described using chitosan supported magnetic ionic liquid nanoparticles (CSMIL) as a novel heterogeneous catalyst. The application of this catalyst allows the synthesis of a variety of tetrazoles in high yields at low temperature. This new magnetic catalyst has been prepared from chitosan (the
The present invention provides a compound of Formula (I)
and pharmaceutical compositions comprising one or more said compounds, and methods for using said compounds for treating or preventing thromboses, embolisms, hypercoagulability or fibrotic changes. The compounds are selective Factor XIa inhibitors or dual inhibitors of Factor XIa and plasma kallikrein.
HClO<sub>4</sub>-SiO<sub>2</sub> as an Efficient and Reusable Heterogeneous Catalyst for the Synthesis of 1-substituted Tetrazoles
作者:Siavash Bahari、Akbar Rezaei
DOI:10.2174/157017861101140113161526
日期:2014.1.31
An efficient and direct protocol is described for the preparation of 1-substituted 1H-1,2,3,4-tetrazoles by the reaction
of primary amines, triethyl orthoformate and sodium azide in the presence of catalytic amount of silica-supported
perchloric acid under solvent-free and heterogeneous conditions. The thermal solvent-free green procedure offers advantages
such as simple methodology, easy work-up, high yield, recovery and reusability of catalyst.
P2O5–SiO2 as an efficient heterogeneous catalyst for the solvent-free synthesis of 1-substituted 1H-1,2,3,4-tetrazoles under conventional and ultrasound irradiation conditions
4-tetrazoles were efficiently synthesized from the reaction of primary amines, triethyl orthoformate, and sodium azide in presence of a catalytic amount of P2O5–SiO2 under conventional and ultrasound irradiation in solvent-freeconditions. The advantages of this procedure are high yields, relatively short reaction times, ease of product isolation, low cost, and recovery and reusability of the catalyst.
摘要在常规量和超声辐射下,在催化量的P 2 O 5 -SiO 2存在下,伯胺,原甲酸三乙酯和叠氮化钠在催化量的P 2 O 5 -SiO 2存在下,可以有效地合成1-取代的1 H -1,2,3,4-四唑。在无溶剂条件下。该方法的优点是产率高,反应时间相对较短,产物分离容易,成本低以及催化剂的回收和可再利用性。 图形概要 。
One‐pot green synthesis of Cu/bone nanocomposite and its catalytic activity in the synthesis of 1‐substituted 1
<i>H</i>
‐1,2,3,4‐tetrazoles and reduction of hazardous pollutants
作者:Mehdi Maham、Mahmoud Nasrollahzadeh
DOI:10.1002/aoc.5097
日期:——
and green method is reported for the biosynthesis of Cu/bone nanocomposite using Cordyline fruticosa extract as a stabilizer and reductant. Animal bone was used as a natural support to prevent the accumulation of Cu nanoparticles. The catalytic activity of Cu/bone nanocomposite was assessed in the synthesis of 1‐substituted 1H‐1,2,3,4‐tetrazoles and reduction of various organicdyes, including 4‐nitrophenol