N- 丙氨基磺酸作为一种绿色且可重复使用的异质纳米催化剂负载在磁性Fe 3 O 4纳米颗粒(MNPs-PSA)上,用于化学选择性制备和脱保护酰基。
摘要:
摘要负载在磁性Fe 3 O 4上的 N- 丙基氨基磺酸纳米粒子(MNPs-PSA)可以简单地合成,并用作高效,环保和化学选择性的催化剂,用于由各种芳族醛与乙酸酐的一锅缩合反应合成1,1-二乙酸酯(酰基)。在室温下在无溶剂的条件下,产品收率高(86–96%),反应时间短(20–60分钟)。除这些结果外,我们还研究了在此催化体系中加水将所得酰基脱保护为苯甲醛衍生物的可能性。更重要的是,这项研究的显着优势是不使用有毒的有机溶剂和催化剂,后处理步骤简单,反应时间短,产品收率高以及外部磁体对MNPs-PSA的回收利用。 图形摘要报道了 一种简单高效的方法,用于在磁性Fe 3 O 4纳米颗粒(MNPs-PSA)上负载 N- 丙基氨基磺酸的情况下,用乙酸酐保护各种醛 。我们进一步研究了在该催化体系中通过添加水作为绿色溶剂将所得酰基脱保护为苯甲醛衍生物的可能性。将该催化剂重复使用几次,而不会损失其催化活性。
DOI:
10.1007/s11164-017-3014-4
作为产物:
描述:
乙酸酐 、 水杨醛 在
molybdophosphoric acid encapsulated into dealuminated zeolite Y 作用下,
反应 1.25h,
以98%的产率得到1,1-diacetoxy-1-(2-hydroxyphenyl)methane
参考文献:
名称:
Host (nanocavity of zeolite-Y)–guest (molybdophosphoric acid) nanocomposite materials: An efficient catalyst for solvent-free synthesis and deprotection of 1,l-diacetates
A succinimide-N-sulfonic acid catalyst for acetylation reactions in absence of a solvent
作者:Farhad SHIRINI、Nader Ghaffari KHALIGH
DOI:10.1016/s1872-2067(11)60499-3
日期:2013.4
Abstract A small amount of succinimide-N-sulfonic acid efficiently catalyzed the acetylation of a variety alcohols, phenols, thiols, amines and aldehydes with acetic anhydride at room temperature under solvent free conditions. This catalyst has the advantages of excellent yields and short reaction times and the reaction can be carried out on a large scale, which makes it potentially useful for industrial
Amorphous carbon-silica composites bearing sulfonic acid as solid acid catalysts for the chemoselective protection of aldehydes as 1,1-diacetates and for N-, O- and S-acylations
作者:Princy Gupta、Satya Paul
DOI:10.1039/c0gc00900h
日期:——
Amorphous carbon-silica composites bearing sulfonic acid derived from inexpensive natural organic compounds (glucose, maltose, cellulose, chitosan and starch) were prepared by partial carbonization followed by sulfonation and their catalytic activity was evaluated for the protection of aldehydes as 1,1-diacetates and for N-, O- and S-acylations under solvent-free conditions. Different biomaterials have been chosen, with a view to select the most active solid acid catalyst. Carbon-silica composites were characterized by FTIR, XRD and elemental analysis. Sulfonated carbon-silica composite derived from starch was found to be the most active and could be recycled for several runs without loss of significant activity. It was also characterized by TGA, SEM and TEM.
(NH<sub>4</sub>)<sub>3</sub>PW<sub>12</sub>O<sub>40</sub> as an Efficient and Reusable Catalyst for the Synthesis and Deprotection of 1,1‐Diacetates
作者:Jitendra R. Satam、Radha V. Jayaram
DOI:10.1080/00397910701798002
日期:2008.1.1
efficient method for the synthesis of 1,1‐diacetates (acylals) from different aldehydes in the presence of (NH4)3PW12O40 and aceticanhydride under solvent‐free conditions at ambient temperature is achieved. Selective conversion of aldehydes was observed in the presence of ketones. The deprotection of acylals has also been achieved using (NH4)3PW12O40 in methanol. The catalyst was found to possess good
Zinc zirconium phosphate as an efficient catalyst for chemoselective synthesis of 1,1-diacetates under solvent-free conditions
作者:ABDOL R HAJIPOUR、HIRBOD KARIMI
DOI:10.1007/s12039-015-0955-2
日期:2015.11
eco-friendliness, chemoselectivity, simple experimental and work-up procedure, solvent-freeconditions and usage of only a stoichiometric amount of AA. Zinc zirconium phosphate nanoparticles were prepared as a green and chemically stable catalyst. Selective protection and deprotection of aldehydes were performed undersolvent-free condition with fair yields.
P2O5/Al2O3 as an efficient heterogeneous catalyst for chemoselective synthesis of 1,1-diacetates under solvent-free conditions
作者:Abdol R. Hajipour、Amin Zarei、Arnold E. Ruoho
DOI:10.1016/j.tetlet.2007.02.090
日期:2007.4
An efficient and chemoselective method for the preparation of acylals from different aldehydes using P2O5/Al2O3 and acetic anhydride undersolvent-freeconditions.
在无溶剂条件下,使用P 2 O 5 / Al 2 O 3和乙酸酐从不同的醛制备酰基的有效且化学选择性的方法。