Glycerol is applied as a green, biodegradable and reusable promoting medium for one-pot three component synthesis of 4H-pyrans under catalyst-free conditions. A broad range of substrates including aromatic and heteroaromatic aldehydes, isatine derivatives, acenaphthenequinone and ninehydrine are condensed with carbonyl compounds possessing a reactive α-methylene group and alkylmalonates. All reactions are completed in short times, and the products are obtained in good to excellent yields. The reaction medium could be recycled and reused several times without any loss of efficiency.
Nano-FGT: a green and sustainable catalyst for the synthesis of spirooxindoles in aqueous medium
作者:Ramen Jamatia、Ajay Gupta、Amarta Kumar Pal
DOI:10.1039/c5ra27552k
日期:——
glutathione grafted nano-organocatalyst (nano-FGT) was used as an efficientcatalyst for the synthesis of spirooxindolederivatives. An aqueous medium, easy separation by an external magnet, efficientcatalyst reusability, low catalyst loading, and column chromatography free separation of the product makes the present procedure green, sustainable and economically viable. The TON and TOF of the nanocatalyst
谷胱甘肽接枝的纳米有机催化剂(nano-FGT)被用作合成螺恶英吲哚衍生物的有效催化剂。水性介质,易于被外部磁体分离,有效的催化剂可重复使用性,低的催化剂负载量以及产物的无柱色谱分离使本发明方法绿色,可持续且经济可行。纳米催化剂的TON和TOF分别达到850 000和56 667 min -1。
Na2EDTA: an efficient, green and reusable catalyst for the synthesis of biologically important spirooxindoles, spiroacenaphthylenes and spiro-2-amino-4H-pyrans under solvent-free conditions
For the first time, the organic salt Na2EDTA was used as a catalyst for an effective and facile preparation of spiro-4H-pyrans via single-pot three-component condensation of isatin/acenaphthoquinone/ninhydrin, malononitrile, and CH-acids through Knoevenagel–Michael–annulation sequence. This new protocol employing Na2EDTA, which is a green, recyclable, and inexpensive catalyst, offers advantages such
第一次,将有机盐Na 2 EDTA用作催化剂,通过Isatin / ac萘醌/茚三酮,丙二腈和CH-酸的单锅三组分缩合反应,有效而便捷地制备spiro-4 H -pyrans通过Knoevenagel–Michael–环形序列。这项采用Na 2 EDTA的新方案是一种绿色,可回收且廉价的催化剂,具有无溶剂,高效反应条件,反应时间短(10-15分钟),后处理容易,收率高等优点。比其他环境合成方法更经济。
Synthesis of spirochromene derivatives catalyzed by Mn(bpyo)2/MCM-41 in water
作者:Mansoureh Daraie、Yahya S. Beheshtiha、Majid M. Heravi
DOI:10.1007/s00706-014-1292-8
日期:2015.1
A three-component one-pot synthesis of spirochromene derivatives by condensing cyclic 1,3-diketones, isatin or acenaphthenequinone, and malononitrile using a catalytic amount of Mn(bpyo)(2)/MCM-41 in refluxing water is reported.
General non-catalytic approach to spiroacenaphthylene heterocycles: multicomponent assembling of acenaphthenequinone, cyclic CH-acids and malononitrile
作者:Michail N. Elinson、Alexey I. Ilovaisky、Valentina M. Merkulova、Pavel A. Belyakov、Fructuoso Barba、Belen Batanero
DOI:10.1016/j.tet.2012.05.005
日期:2012.7
The new type of non-catalytic cascade reaction was found: the direct multicomponent reaction of acenaphthenequinone, cyclic CH-acids, and malononitrile to form spiroacenaphthylene heterocycles. The direct heating in water acenaphthenequinone, cyclic CH-acids, and malononitrile at 80 degrees C results in the formation of spiroacenaphthylene heterocycles in 90-95% yields. Thus, a new simple and efficient green 'one-pot' method to synthesize substituted spiroacenaphthylene frameworks was found directly from simple starting compounds. The application of this convenient green multicomponent method is also beneficial from the viewpoint of diversity-oriented large-scale processes. (C) 2012 Elsevier Ltd. All rights reserved.