The magnetic nanostructured natural hydroxyapatite (HAP/Fe3O4 NPs): an efficient, green and recyclable nanocatalyst for the synthesis of biscoumarin derivatives under solvent-free conditions
The magnetic nanostructured natural hydroxyapatite (HAP/Fe3O4 NPs) as a novel magnetic nanocatalyst was synthesized and fully characterized. The excellent catalytic activity of HAP/Fe3O4 NPs was investigated in the synthesis of biscoumarin derivatives under mild, green and solvent-freeconditions. A series of aromatic (bearing different functional groups), heteroaromatic and aliphatic aldehydes have
摘要合成并充分表征了 磁性纳米结构天然羟基磷灰石(HAP / Fe 3 O 4 NPs)。HAP / Fe 3 O 4的优异催化活性在温和,绿色和无溶剂条件下合成双香豆素衍生物中研究了NP。一系列芳香族(具有不同的官能团),杂芳香族和脂肪族醛已被转化为双香豆素,具有良好的分离产率。本方法与绿色化学原理非常吻合的显着优点是:催化剂便宜,无毒,易于处理且可重复使用多达六次循环,纳米结构催化剂的磁分离,后处理简单,反应时间短,产品的高收率和使用无溶剂条件。 图形概要
Camphor sulfonic acid catalyzed facile and general method for the synthesis of 3,3'-(arylmethylene)<i>bis</i>(4-hydroxy-2<i>H</i>-chromen-2-ones), 3,3'-(arylmethylene)<i>bis</i>(2-hydroxynaphthalene-1,4-diones) and 3,3'-(2-oxoindoline-3,3-diyl)<i>bis</i>(2-hydroxynaphthalene-1,4-dione) derivatives at room temperature
sulfonic acid catalyzed a straightforward, efficient, and general method has been developed for the synthesis of 3,3'-(arylmethylene)bis(4-hydroxy-2H-chromen-2-ones), 3,3'-(arylmethylene)bis(2-hydroxynaphthalene-1,4-diones) and 3,3'-(2-oxoindoline-3,3-diyl)bis(2-hydroxynaphthalene-1,4-dione) derivatives in aqueous ethanol at room temperature from the reactions of various aromatic aldehydes and 4-hydroxycoumarin
Starch–sulfuric acid as a bio-supported and recyclable solid acid catalyst for rapid synthesis of α,α′-benzylidene bis(4-hydroxycoumarin) derivatives
作者:Ramin Rezaei、Mohammad Reza Sheikhi
DOI:10.1007/s11164-013-1272-3
日期:2015.3
environmentally benign synthesis of α,α′-benzylidene bis(4-hydroxycoumarin) derivatives has been achieved by reaction of aromatic aldehydes with 4-hydroxycoumarin. The catalyst is reusable and has remarkable activity. This procedure has several advantages including high yields, short reaction times, easy work-up, and use of an inexpensive, moderately acidic, safe catalyst.
A reusable magnetic nickel nanoparticle based catalyst for the aqueous synthesis of diverse heterocycles and their evaluation as potential anti-bacterial agent
recyclable catalyst. The method is simple, eco-friendly and gave excellent yields of the products without taking recourse to columnchromatographic separation procedures. Computational method was employed to elucidate the selective formation of uncyclised product in reactioncourse. The biological activity of the synthesized compounds were investigated and the results demonstrated profound antibacterial
CAL-B accelerated novel synthetic protocols for 3,3’-arylidenebis-4-hydroxycoumarins and dimethyl ((substituted phenyl) (phenylamino)methyl) phosphonates
作者:Anusaya S. Chavan、Arun S. Kharat、Manisha R. Bhosle、Sambhaji T. Dhumal、Ramrao A. Mane
DOI:10.1007/s11164-021-04535-2
日期:2021.11
Green protocols for the syntheses of 3,3′-arylidenebis-4-hydroxycoumarins and dimethyl ((substituted phenyl) (phenylamino)methyl) phosphonates have been first time developed using biocatalyst, CAL-B (lipase). These are carried at room temperature under stirring and are convenient and cost effective. The developed protocols are environmentally acceptable and are giving better to excellent yields of