A mild, simple and convenient procedure for the synthesis of spiro-oxindole heterocycles containing fused 4H-pyran ring and also bis-2-amino-4H-pyrans derivatives was described using C4(DABCO-SO3H)2·4Cl as a nano, efficient, cheap, and reusable catalyst under mild and homogeneous conditions.
Synthesis and characterization of acetic acid functionalized poly (4-vinylpyridinium) salt as new catalyst for the synthesis of spiropyran derivatives and their biological activity
作者:Ahmad Reza Moosavi-Zare、Mohammad Ali Zolfigol、Ehsan Noroozizadeh、Mahmoud Zarei、Roya Karamian、Mostafa Asadbegy
DOI:10.1016/j.molcata.2016.10.011
日期:2016.12
Abstract Acetic acid functionalized poly(4-vinylpyridinium) bromide (APVPB), as a new and heterogeneous catalyst, was designed and successfully tested on the synthesis of 2-aminospiro[indoline-3,4ʹpyran]-2-one and spiro[indeno[1,2-b]quinoxaline-11,4-pyran]-2ʹ-amine derivatives. Also, infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), differential thermal gravimetric (DTG), scanning
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。
One-Pot Synthesis of Biologically Important Spiro-2-amino-4<i>H</i>-pyrans, Spiroacenaphthylenes, and Spirooxindoles Using DBU as a Green and Recyclable Catalyst in Aqueous Medium
作者:Pooja Saluja、Komal Aggarwal、Jitender M. Khurana
DOI:10.1080/00397911.2012.760130
日期:2013.12.17
Abstract We have reported DBU-catalyzed one-potsynthesis of biologically and pharmacologically important spiropyrans from condensation of malononitrile/ethyl cyanoacetate, 1,3-dicarbonyl compounds, and ninhydrin/acenaphthequinone/istain in good yields. This new protocol employing DBU, which is a green, recyclable, and inexpensive catalyst, offers advantages such as mild reaction conditions, short
New role for photoexcited organic dye, Na2 eosin Y via the direct hydrogen atom transfer (HAT) process in photochemical visible-light-induced synthesis of spiroacenaphthylenes and 1H-pyrazolo[1,2-b]phthalazine-5,10-diones under air atmosphere
作者:Farzaneh Mohamadpour
DOI:10.1016/j.dyepig.2021.109628
日期:2021.10
A green multi-component tandem strategy for metal-free synthesizing spiroacenaphthylenes and 1H-pyrazolo[1,2-b]phthalazine-5,10-diones by Knoevenagel-Michael cyclocondensation is reported via organic dye Na2 eosin Y-derived photoexcited states functions as a direct hydrogen atom transfer (HAT) catalyst via visible light-mediated in aqueous ethyl lactate at ambienttemperature under air atmosphere.
通过有机染料 Na 2曙红 Y 衍生的光激发态,通过Knoevenagel-Michael 环缩合反应无金属合成螺苊和 1 H-吡唑并[1,2 - b ]酞嗪-5,10-二酮的绿色多组分串联策略在环境温度和空气气氛下,通过可见光介导的乳酸乙酯水溶液作为直接氢原子转移 (HAT) 催化剂。这项研究为进一步使用具有商业可用性和廉价性的无金属有机染料 Na 2曙红Y在光化学合成中使用最少的催化剂,能源效率高,收率高,操作简单,反应省时,原子经济性高,从而满足可持续和绿色化学的一些特征。值得注意的是,这种环化反应也可以在克级规模上运行,这凸显了该反应在工业用途中的潜力。