- L-proline as an efficient asymmetric induction catalyst in the synthesis of chromeno[2,3-d]pyrimidine-triones, xanthenes in water
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The multi-component reactions involving aromatic aldehydes, dimethylcyclohexane-1, 3-dione/cyclohexane-1, 3-dione and barbituric acids were carried out in presence of the organo catalyst L-proline in aqueous medium at ambient temperature. The reactions af
- Bhattacharjee, Deboshikha,Sutradhar, Dipankar,Chandra, Asit K.,Myrboh, Bekington
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- Copper iodide nanoparticles on poly(4-vinylpyridine): A new and efficient catalyst for the synthesis of 1,8-dioxooctahydroxanthenes under solvent-free conditions
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Poly(4-vinylpyridine)-supported nanoparticles of copper(I) iodide is reported as a new, efficient and recyclable catalyst for the synthesis of 1,8-dioxooctahydroxanthenes under solvent-free conditions. This catalyst can be recovered by simple filtration a
- Albadi, Jalal,Keshavarz, Mosadegh,Abedini, Masoumeh,Khoshakhlagh, Moloud
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- Imidazol-1-yl-acetic acid as a novel green bifunctional organocatalyst for the synthesis of 1,8-dioxooctahydroxanthenes under solvent-free conditions
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Imidazol-1-yl-acetic acid is introduced as a new, efficient and recyclable green bifunctional organocatalyst for the synthesis of 1,8- dioxooctahydroxanthenes under solvent-free conditions. This catalyst is water soluble and can be separated from the prod
- Nazari, Simin,Keshavarz, Mosadegh,Karami, Bahador,Iravani, Nasir,Vafaee-Nezhad, Masoumeh
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Read Online
- Introduction of a trinuclear manganese(iii) catalyst on the surface of magnetic cellulose as an eco-benign, efficient and reusable novel heterogeneous catalyst for the multi-component synthesis of new derivatives of xanthene
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In this work, the new trinuclear manganese catalyst defined as Fe3O4@NFC@NNSM-Mn(iii) was successfully manufactured and fully characterized by different techniques, including FT-IR, XRD, TEM, SEM, EDX, VSM, and ICP analysis. There have been reports of the use of magnetic catalysts for the synthesis of xanthine derivatives. The critical potential interest in the present method include short reaction time, high yields, recyclability of the catalyst, easy workup, and the ability to sustain a variety of functional groups, which give economical as well as ecological rewards. Also, the synthesized catalyst was used as a recyclable trinuclear catalyst in alcohol oxidation reactions at 40 °C. The magnetic catalyst activity of Fe3O4@NFC@NNSM-Mn(iii) could be attributed to the synergistic effects of the catalyst Fe3O4@NFC@NNS-Mn(iii) with melamine. Employing a sustainable and safe low temperature, using an eco-friendly solvent, no need to use any additive, and long-term stability and magnetic recyclability of the catalyst for at least six successive runs are the advantages of the current protocol towards green chemistry. This protocol is a benign, environmentally friendly method for heterocycle synthesis. This journal is
- Ghamari Kargar, Pouya,Bagherzade, Ghodsieh,Eshghi, Hossein
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p. 4339 - 4355
(2021/02/03)
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- Magnetic Fe–Cr–Ni oxide alloy nano-belts prepared from the chemical decomposition of a stainless steel screw (a top-down approach): an efficient and cheap catalyst for multicomponent reactions
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Abstract: A new, cheap, and accessible method has been used for the preparation of nano-belts from the chemical decomposition (top-down approach) of a cheap stainless steel screw and found as an efficient magnetically recyclable nanocatalyst for the prepa
- Kazemnejadi, Milad,Sharafi, Zeinab,Mahmoudi, Boshra,Zeinali, Atefeh,Nasseri, Mohammad Ali
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p. 777 - 787
(2019/11/21)
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- Nano-zirconia as an excellent nano support for immobilization of sulfonic acid: A new, efficient and highly recyclable heterogeneous solid acid nanocatalyst for multicomponent reactions
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Nano-zirconia-supported sulfonic acid [nano-ZrO2-SO3H (n-ZrSA)] is synthesized by immobilizing sulfonic acid groups on the surface of nano zirconium dioxide to produce a novel heterogeneous reusable solid acid nanocatalyst. This new nanocatalyst is characterized by FT-IR spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), the Hammett acidity function and pH analysis. The introduced nano-zirconia-supported sulfonic acid is used as an efficient and recyclable catalyst for different heterocyclic multicomponent reactions such as the synthesis of hexahydroquinoline, 1,8-dioxo-decahydroacridine, polyhydroquinoline and 1,8-dioxo-octahydroxanthene derivatives. Optimization of the reaction conditions was studied using a central composite design (CCD) which is one of the most widely used response surface methodologies. The newly prepared heterogeneous solid acid nanocatalyst is easily separated and reusable for five cycles without any apparent loss of its catalytic activity, which confirmed the stability of the covalent bonding of the sulfonic acid groups. n-ZrSA has advantages such as its low cost, low toxicity, ease of preparation, good stability, high reusability and operational simplicity.
- Amoozadeh, Ali,Rahmani, Salman,Bitaraf, Mehrnoosh,Abadi, Fatemeh Bolghan,Tabrizian, Elham
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p. 770 - 780
(2016/01/12)
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- Facile and efficient synthesis of xanthenedione derivatives promoted by niobium pentachloride
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Xanthenedione derivatives were synthesised in one-pot reactions between arylaldehyde derivatives and 1, 3-cyclohexanedione promoted by niobium pentachloride. This new method is simple, cost-effective, high-yielding with a good variety of substrates genera
- Dos Santos, Willian H.,Da Silva-Filho, Luiz C.
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p. 1658 - 1664
(2016/10/11)
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- Efficient synthesis of 1,8-dioxo-octahydroxanthenes catalyzed by β-cyclodextrin grafted with butyl sulfonic acid in aqueous media
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β-Cyclodextrin was functionalized with butyl sulfonic acid to give an efficient, eco-friendly catalyst for the synthesis of 1,8-dioxo-octahydroxanthenes via the one-pot condensation of aromatic aldehydes and active methylene carbonyl compounds in aqueous
- Gong, Kai,Wang, Hualan,Wang, Shuxin,Wang, Ying,Chen, Jinghua
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p. 1249 - 1255
(2015/09/01)
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- Nano-WO3-supported sulfonic acid: New, efficient and high reusable heterogeneous nano catalyst
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Nano-WO3-supported sulfonic acid [n-WO3-SO3H (n-WSA)] is easily prepared from the reaction of nano WO3 with chlorosulfonic acid as sulfonating agent. This new catalyst is characterized by X-ray diffraction(XRD), field emission scanning electron microscopy (FE-SEM), FT-IR spectroscopy, thermal gravimet-ric analysis (TGA), pH analysis and Hammett acidity function. Nano-WO3-supported sulfonic acid isused as an efficient and recyclable catalyst for some organic reactions such as synthesis of 1,8-dioxo-octahydroxanthene, tetrahydrobenzoxanthene and benzimidazolo quinazolinone derivatives. All of thereactions are very fast and the yields are excellent. The used catalyst was easily separated and reused for 10 runs without appreciable loss of its catalytic activity.
- Amoozadeh, Ali,Rahmani, Salman
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- Nano-WO3-supported sulfonic acid: New, efficient and high reusable heterogeneous nano catalyst
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Nano-WO3-supported sulfonic acid [n-WO3-SO3H (n-WSA)] is easily prepared from the reaction of nano WO3 with chlorosulfonic acid as sulfonating agent. This new catalyst is characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), FT-IR spectroscopy, thermal gravimetric analysis (TGA), pH analysis and Hammett acidity function. Nano-WO3-supported sulfonic acid is used as an efficient and recyclable catalyst for some organic reactions such as synthesis of 1,8-dioxo-octahydroxanthene, tetrahydrobenzoxanthene and benzimidazolo quinazolinone derivatives. All of the reactions are very fast and the yields are excellent. The used catalyst was easily separated and reused for 10 runs without appreciable loss of its catalytic activity.
- Amoozadeh, Ali,Rahmani, Salman
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- Alkaline earth metal catalyzed, one-pot, multi-component approach for the synthesis of dihydropyridine, acridine and xanthene derivatives in water
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Ca(II) catalyzed one-pot multicomponent approach for the biologically important diverse heterocyclic compounds such as hexahydroxanthene diones, dihydropyridines and octahydroacridine diones has been described in water. Use of environmentally benign catal
- Yaragorla, Srinivasarao,Singh, Garima,Pareek, Abhishek
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p. 1321 - 1326
(2015/11/10)
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- Alkaline earth metal catalyzed, one-pot, multi-component approach for the synthesis of dihydropyridine, acridine and xanthene derivatives in water
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Ca(II) catalyzed one-pot multicomponent approach for the biologically important diverse heterocyclic compounds such as hexahydroxanthene diones, dihydropyridines and octahydroacridine diones has been described in water. Use of environmentally benign catal
- Yaragorla, Srinivasarao,Singh, Garima,Pareek, Abhishek
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p. 1321 - 1326
(2016/02/23)
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- Bi-SO3H functionalized ionic liquid based on DABCO as a mild and efficient catalyst for the synthesis of 1,8-dioxo-octahydro-xanthene and 5-arylmethylene-pyrimidine-2,4,6-trione derivatives
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1,8-Dioxo-octahydro-xanthenes are easily prepared via the condensation of aldehydes with 1,3-cyclohexadione and/or dimedone using N-sulfonated DABCO as a new and efficient catalyst. This reagent is also efficiently able to catalyze the condensation of aldehydes with barbituric acid leading to 5-arylmethylene-pyrimidine-2,4,6-triones. The structure of the products was characterized by their IR, 1H NMR, and 13C NMR spectroscopy. The present methodology offers several advantages such as ease of preparation and handling of the catalyst, high yields, simple and green procedure, low cost, short reaction times, easy work-up, and preformation of the reaction in the absence of solvent or in water as a green solvent.
- Shirini, Farhad,Langarudi, Mohaddeseh Safarpoor Nikoo,Seddighi, Mohadeseh,Jolodar, Omid Goli
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p. 8483 - 8497
(2015/01/30)
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- Use of nanoporous Na+-montmorillonite sulfonic acid (SANM) as an eco-benign, efficient and reusable solid acid catalyst for the one-pot synthesis of 14-aryl-14-H-dibenzo[a,j]xanthenes and 1,8-dioxo- dodecahydroxanthene derivatives
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Nanoporous Na+-montmorillonite sulfonic acid was found to be an efficient and green catalyst for the synthesis of various 14-aryl-14H-dibenzo[a, j]xanthenes and 1,8-dioxo-dodecahydroxanthene derivatives by the reaction of aldehydes with 2-napht
- Shirini, Farhad,Mamaghani, Manouchehr,Atghia, Seyyed Vahid
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p. 415 - 420
(2013/07/27)
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- Alumina-sulfuric acid catalyzed eco-friendly synthesis of xanthenediones
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Alumina-sulfuric acid has been developed as a cost-effective, recyclable, heterogeneous solid acid catalyst for the eco-friendly synthesis of 9-aryl-1,8-dioxododecahydroxanthenes and 9-aryl-3,3,6,6-tetramethyl-1,8- dioxooctahydroxanthenes through the cond
- Pramanik, Amit,Bhar, Sanjay
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experimental part
p. 17 - 24
(2012/06/16)
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- CsF mediated rapid condensation of 1,3-cyclohexadione with aromatic aldehydes: Comparative study of conventional heating vs. ambient temperature
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A mild, efficient and high yielding protocol for the synthesis of 2,2′-arylmethelene dicyclohexane-1,3-dione derivatives at room temperature and 9-aryl-1,8-dihydrooctahydroxanthene at conventional heating using cesium fluoride as a catalyst is reported. T
- Nandre, Kamalakar P.,Patil, Vijay S.,Bhosale, Sidhanath V.
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experimental part
p. 777 - 780
(2012/01/03)
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- Envirocat EPZ-10: A solid acid catalyst for the synthesis of 1,8-dioxo-octahydroxanthenes in aqueous medium
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An efficient method for synthesis of 1,8-dioxo-octahydroxanthenes using EPZ-10 as a heterogeneous catalyst is developed. In this method, aldehydes and dimedone/cyclohexane-1,3-dione are heated at 70C in the presence of a catalytic amount of EPZ-10 in wate
- Pore,Shaikh,Patil,Dongare,Desai
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experimental part
p. 2215 - 2219
(2010/09/18)
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- Synthesis of some novel barbituric acid and 1,3-cyclohcxancdionc based condensed hetcrocycles
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Synthesis of some novel condensed heterocycles based on peripheral barbituric acid/l,3-cyclohcxanedione moieties and central pyran, pyridine and thiin (thiopyran) ring systems has been achieved by the condensation of barbituric acid/l,3-cyclohexanedionc w
- Sachar, Anand,Gupta, Poonam,Gupta, Shallu,Sharma
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experimental part
p. 1187 - 1194
(2010/01/06)
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- Glycerol as a promoting medium for electrophilic activation of aldehydes: Catalyst-free synthesis of di(indolyl)methanes, xanthene-1,8(2H)-diones and 1-oxo-hexahydroxanthenes
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Glycerol was used, for the first time, as a green and effective promoting medium for electrophilic activation of aldehydes, and with which, a catalyst-free system for some reactions that conventionally carried out using acid catalysts, such as synthesis o
- He, Fei,Li, Peng,Gu, Yanlong,Li, Guangxing
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experimental part
p. 1767 - 1773
(2011/02/27)
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- Condensation of 1,3-cyclohexanedione with aromatic aldehydes catalyzed by acidic ionic liquids
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An efficient and convenient approach to the synthesis of 9-aryl-2, 3, 4, 5, 6, 7-hexahydro-2H-Xanthene-1, 8-dionc by condensation of 1, 3-cyclohexanedione with aromatic aldehydes catalyzed by acid ionic liquid 1-methyllimidazolium hydrogen sulphate ([Hmim
- Kang, Hui,Hu, Yi,Huang, He,Wei, Ping
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scheme or table
p. 223 - 227
(2009/04/14)
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- A green and efficient synthesis of 9-aryl-3,4,5,6,7,9-hexahydroxanthene-1, 8-dione using a task-specific ionic liquid as dual catalyst and solvent
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A green and efficient method for the preparation of 9-aryl-3,4,5,6,7,9- hexahydro-1H-xanthene-1,8(2H)-dione has been developed using functionalized ionic liquids as a catalyst and a reaction medium. The nature of both the counter anion and cation influenc
- Ma, Jingjun,Zhou, Xin,Zang, Xiaohuan,Wang, Chun,Wang, Zhi,Li, Jingci,Li, Qing
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p. 146 - 148
(2008/02/11)
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- Chlorosulfonation of 9-aryloctahydroxanthen-1,8-diones
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The 9-aryloctahydroxanthen-1,8-diones (3, 4-24) were prepared by reaction of cyclohexan-1,3-dione (1) with selected arylaldehydes. The xanthendiones (4-9, 11, 12, 18, 21, 22) were successfully reacted with chlorosulfonic acid, and the crude sulfonyl chlorides were converted into 15 sulfonamides (26-40) for screening as potential pesticides. Attempted chlorosulfonation of the xanthendiones (13-17) was unsuccessful. α-Methylcinnamaldehyde was reacted with cyclohexandione (1) to yield the corresponding xanthendione derivative (23). On the other hand, with o-methoxycinnamaldehyde an impure product formed and the p-methoxy isomer afforded the corresponding 2-arylpyran (25). The NMR spectral data of the compounds are briefly discussed.
- Cremlyn, Richard J.,Shabbir, Ghulam
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p. 2635 - 2643
(2007/10/03)
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- Multicomponent synthesis of 2,5-dioxo- and 4-aryl-5-oxo-2-thioxo-1,2,3,4,5, 6,7,8-octahydroquinazolines
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Ten 2,5-dioxo- and 4-aryl-5-oxo-2-thioxo-1,2,3,4,5,6,7,8- octahydroquinazolines have been synthesized in three-component interactions of 1,3-cyclohexanedione or dimedone, urea or thiourea, and substituted benzaldehydes (3-bromo-, 4-bromo-, 4-fluoro-, 4-methoxy-, 3,4-methylenedioxy-, and 3-nitro-). 9-Aryl-4,5-dioxo-1,2,3,4,5,6,7,8-octahydro-9H-xanthenes were also formed in these reactions.
- Tonkikh,Strakovs,Petrova
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