An eco-friendly catalytic route for synthesis of 4-amino-pyrazolo[3,4-d]pyrimidine derivatives by Keggin heteropolyacids under classical heating and microwave irradiation

Heravi, Majid M.; Rajabzadeh, Ghadir; Bamoharram, Fatemeh F.; Seifi, Nasim

doi:10.1016/j.molcata.2006.04.016

Cited by 56 publications

(17 citation statements)

References 41 publications

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“…Various heteropolyacids such as H 3 (15) from the reaction of 1-substituted-5-amino-4-cyano-pyrazoles and formamid under classical heating and microwave irradiation (Scheme 13) [50]. The microwave-solid acid combination, led to a nice and convenient catalytic synthesis of 4-aminopyrazolo [3,4-d]pyrimidines with much reduced reaction times compared to traditional conditions.…”

Section: -Amino-pyrazolo[34-d]pyrimidinementioning

confidence: 99%

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

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Heteropolyacids, their salts and polyoxometalates have been used as catalysts in wide range of organic reactions such as multi components, oxidation, reductions, electrochemical and photochemical reactions. There have been tremendous and continued efforts to modify the catalytic performance of heteropoly acids such as supporting them on MCM, silica gel, etc. In this review, we have attempted to bring some of new applications of heteropolyacids in organic reactions and recent approaches on modifying them, into focus.

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Section: -Amino-pyrazolo[34-d]pyrimidinementioning

confidence: 99%

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

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“…Due to our interests in heterogeneous catalysis, applied in a variety of organic transformations [13][14][15][16][17][18][19][20][21][22][23], and recent successful attempts for the syntheses of 1,2,3-triazoles, via click reaction [24][25][26][27][28][29][30][31][32][33][34][35][36], in this paper we wish to report the preparation of copper nano catalyst on modified KIT-5 (CuI/AK) as a superior heterogeneous catalyst in the syntheses of 1,2,3-triazoles via click reaction. This heterogeneous catalyst system exhibited an excellent catalytic performance for 1,3-dipolar Huisgen cycloaddition reaction in the construction of the various 1,2,3-triazole derivatives.…”

Section: Introductionmentioning

confidence: 99%

In situ prepared copper nanoparticles on modified KIT-5 as an efficient recyclable catalyst and its applications in click reactions in water

Mirsafaei

Heravi

Ahmadi

et al. 2015

Journal of Molecular Catalysis A: Chemical

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“…emerged as viable alternatives to conventional materials, as robust, readily available, oxidative stability, biological compatibility, and high catalytic activities in various organic transformations [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Using magnetic nanoparticles Fe3O4 as a reusable catalyst for the synthesis of pyran and pyridine derivatives via one-pot multicomponent reaction

et al. 2015

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In recent years, several methods and developments have been reported for the synthesis of pyran and pyridine [13][14][15][16][17] derivatives; each has its own merits and drawbacks. Many of the standard procedures require long reaction times, harsh reaction conditions, expensive and toxic reagents, solvents, and tedious work-up procedures. Moreover in some cases, a mixture of products is obtained, needing cost-effective column chromatography, naturally resulting in low yields. Heterogeneous catalysis is of supreme importance in many areas of the chemical and energy consuming industries [18,19].Conducting the reactions, using heterogenous catalysts should compensate some of drawbacks observed in previously reported reactions. In this kind of reaction, the catalyst can be separated by filtration. However, it is worthy to mention in spite of several advantages, experienced, practically in using of heterogenous catalysts, due to the nanosized particles used, few limitations to the sustainability are observed [20].To get around these problems, the use of a heterogeneous catalyst which can be separated practically other than filtration is desirable. Magnetite nanoparticles (Fe 3 O 4 ) have attracted much attention in the past decade, due to their unique features, including, low preparation cost, high thermal and mechanical stability, and adaptability for largescale production. In addition, their paramagnetic nature allows their facile and effective separation from the reaction mixture, without using standard filtration, required in separation of heterogeneous catalysts. Magnetite nanoparticles (Fe 3 O 4 ) can be easily separated from reaction mixture by using just an external magnet [21].Thus, in recent years, nano-Fe 3 O 4 [22] has attracted a great attention as heterogeneous catalyst [23] due to its simple handling, easy of recovery with an external magnetic field [24,25]. Magnetic nanoparticles (MNPs) have Abstract An atom-economical, efficient and mild protocol is described for the synthesis of 2-amino-3-cyanopyridine and 2-amino-3-cyano-4H-pyran derivatives in the presence of high surface area Fe 3 O 4 as a highly effective heterogeneous catalyst via one-pot multicomponent cyclocondensation reaction.

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An eco-friendly catalytic route for synthesis of 4-amino-pyrazolo[3,4-d]pyrimidine derivatives by Keggin heteropolyacids under classical heating and microwave irradiation

Cited by 56 publications

References 41 publications

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

In situ prepared copper nanoparticles on modified KIT-5 as an efficient recyclable catalyst and its applications in click reactions in water

Using magnetic nanoparticles Fe3O4 as a reusable catalyst for the synthesis of pyran and pyridine derivatives via one-pot multicomponent reaction

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