فهرس المقالات Pyranopyrazole

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  1 - Y(NO3)3.6H2O catalyzed Four-Component Reaction for the Synthesis of Highly Functionalized Pyrano[2,3-c]pyrazoles in Aqueous Medium
  Mohyeddin Safarzaei Malek Taher Maghsoodlou Ebrahim Mollashahi Mojtaba Lashkari Nourallah Hazeri
  An efficient one-pot four-component protocol for the synthesis of pyrano[2,3-c]pyrazolederivatives has been demonstrated using Y(NO3)3.6H2O as catalyst under mild condition. This isa general synthetic protocol which could be applicable to a wide range of carbonyl compou أکثر

  An efficient one-pot four-component protocol for the synthesis of pyrano[2,3-c]pyrazolederivatives has been demonstrated using Y(NO3)3.6H2O as catalyst under mild condition. This isa general synthetic protocol which could be applicable to a wide range of carbonyl compoundsincluding aromatic aldehydes, isatins and acenaphthenequinone. All The reactions proceededsmoothly, high-yielding and purity via an easy work-up procedure. تفاصيل المقالة
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  2 - Fe3O4@SiO2/BiPy‏2+2Cl– nanocomposite promoted rapid synthesis of Pyranopyrazole and Octahydroquinazoline derivatives
  Sara Hosseini Ali Reza Kiasat Asadollah Farhadi
  Fe3O4@SiO2/bipyridinium chloride nanocomposite, Fe3O4@SiO2/BiPy+22Cl-, as a magnetically separable and recyclable heterogeneous catalyst was used for the one-pot synthesis of pyranopyrazole and octahydroquinazoline derivatives via multi-components cyclocondensation reac أکثر

  Fe3O4@SiO2/bipyridinium chloride nanocomposite, Fe3O4@SiO2/BiPy+22Cl-, as a magnetically separable and recyclable heterogeneous catalyst was used for the one-pot synthesis of pyranopyrazole and octahydroquinazoline derivatives via multi-components cyclocondensation reaction under solvent free conditions. The catalyst was recovered by simple magnetic decantation and can be recycled several times with no significant loss of its catalytic activity. The results showed that the desired products were obtained with high efficiency, rapid, simple, and eco-friendly. تفاصيل المقالة
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  3 - Green synthesis of pyranopyrazoles using Tungestic acid/Zr bio-based MOF as an efficient heterogeneous catalyst
  Shima Khademi Saeed Zahmatkesh Alireza Aghili Rashid Badri
  This reported work aims to fabricate an eco-friendly Zr bio-based MOF as a new magnetic nanocatalyst based on the immobilization of tungstic acid onto new design robust, cost-effective, green and scalable Zirconium-L-aspartate amino acid metal-organic framework (MOF)-gr أکثر

  This reported work aims to fabricate an eco-friendly Zr bio-based MOF as a new magnetic nanocatalyst based on the immobilization of tungstic acid onto new design robust, cost-effective, green and scalable Zirconium-L-aspartate amino acid metal-organic framework (MOF)-grafted L-(+)-tartaric acid stabilized magnetite nanoparticles (Fe3O4/Tart-NPs) was successfully prepared by two successive hydrothermal method. This catalyst was characterized by FT-IR, XRD, FE-SEM and TGA-DTA analysis. This catalyst is outstanding to prepare l ‐ (4 ‐ phenyl) ‐ 2,4 ‐ dihydropyrano [2,3 ‐ c] pyrazole derivatives in aqueous media due to the open metal sites, high and steady proton conductivity in the zirconium-MOF, MIP-202(Zr), MOF and also due to Brønsted acid properties of tungstic acid. This acidic catalyst can easily be extracted by an outward magnetic field after completion of the reaction without any deactivation or selectivity loss. The products were characterized by spectroscopic analysis (1HNMR,13CNMR and also FTIR). The optimized reaction conditions and a possible reaction mechanism is outlined. تفاصيل المقالة
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  4 - Synthesis of Pyranopyrazole Compounds Using Heterogeneous Base Catalyst Based on 1,3,5-Triazine-2,4,6-Triamine Modified Nano Rice Husk Silica
  Jamal Davarpanah Reza Khoram
  10.22034/jna.2017.01.003
  In the current study, amorphous silica nanoparticles were easily extracted from rice husk ash. The target composite was synthesized by the direct incorporation of chloropropyl groups through the condensation of nanosilica and 3-chloropropyl trimethoxysilane and then gra أکثر

  In the current study, amorphous silica nanoparticles were easily extracted from rice husk ash. The target composite was synthesized by the direct incorporation of chloropropyl groups through the condensation of nanosilica and 3-chloropropyl trimethoxysilane and then grafting of 1,3,5-triazine-2,4,6-triamine (Melamine) onto the propyl groups by the simple nucleophilic substitution reaction (RHA@Melamine). The resulting solid catalyst was characterized by infrared spectroscopy, scanning electron microscope and thermogravimetric analysis. The catalytic activity of this solid acid nanocomposite was probed through one-pot synthesis of 1,4-dihydropyrano[2,3-c] pyrazole via four-component couplings of aldehydes, hydrazine hydrate, ethyl acetoacetate and malononitrile under solvent-free conditions. In this reaction, RHA@Melamine shows good catalytic nature, easy to handle procedure, recycle exploitation and excellent isolated yields of products. تفاصيل المقالة
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  5 - Green approach for the synthesis of pyranopyrazoles and hexahydroquinoline-3-carboxamides using unripe grape juice (verjuice) as catalyst
  Masoud Mokhtary
  Unripe grape juice (verjuice) as a natural catalyst was successfully applied to perform the one-pot reaction of aryl aldehydes, malononitrile, hydrazine hydrate and ethyl acetoacetate to synthesize pyranopyrazole derivatives in aqueous ethanol at room temperature in exc أکثر

  Unripe grape juice (verjuice) as a natural catalyst was successfully applied to perform the one-pot reaction of aryl aldehydes, malononitrile, hydrazine hydrate and ethyl acetoacetate to synthesize pyranopyrazole derivatives in aqueous ethanol at room temperature in excellent yields. Furthermore, unripe grape juice catalyzed one-pot synthesis of hexahydroquinoline-3-carboxamide derivatives by the four-component reaction of arylaldehydes, dimedone, acetoacetanilide and ammonium acetate in high to excellent yield in ethanol at 70 ℃. The synthesized compounds were identified by FT-IR, 1H NMR and 13C NMR spectroscopic techniques and elemental analysis. An environmentally benign procedure, short reaction time, high yields and biocompatible natural catalyst are some advantages of this research. تفاصيل المقالة
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  6 - Brönsted acidic ionic liquid as a recyclable catalyst for the one pot four-component synthesis of substituted pyrano[2,3-c]pyrazoles
  Leila Khazdooz Amin Zarei
  An efficient, mild and environmentally friendly method was reported for the synthesis of An efficient, mild and environmentally friendly method was reported for the synthesis of pyranopyroles from aryl aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate i أکثر

  An efficient, mild and environmentally friendly method was reported for the synthesis of An efficient, mild and environmentally friendly method was reported for the synthesis of pyranopyroles from aryl aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate in the presence of catalytic amounts of Methyl imidazolium hydrogen sulfate ([Hmim][HSO4]) as an efficient catalyst. These syntheses were performed via a one-pot four-component condensation in water/ethanol (50%) at 50 ◦C. This method easily provides the coresponding products in good yield and relatively short reaction times. Also the reusability of the catalyst was investigated, the catalyst could be employed four times, although its activity gradually decreased. تفاصيل المقالة
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  7 - Fe3O4@FSM-16-SO3H as a new magnetically recyclable nanostructured catalyst: synthesis, characterization and catalytic application for the synthesis of pyrano[2,3-c]pyrazoles
  Somayeh Hashemi-Uderji Mohammad Abdollahi-Alibeik Reza Ranjbar-Karimi
  A three-component process for the one-pot synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles is described by the three-component reaction of aldehydes, 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one and malononitrile in the presence of Fe3O4 أکثر

  A three-component process for the one-pot synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles is described by the three-component reaction of aldehydes, 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one and malononitrile in the presence of Fe3O4@FSM-16-SO3H as an efficient magnetically recyclable mesoporous catalyst. Folded sheet mesoporous material (FSM-16) was prepared by intercalation of a layered, kanemite type sodium silicate with cetyltrimethylammonium (CTMA) ions in the presence of dispersed Fe3O4. The Fe3O4@FSM-16-SO3H was synthesized by sulfonation of Fe3O4@FSM-16 and characterized by FESEM, XRD, BET, VSM and FT-IR techniques. This protocol suggests benefits in terms of higher yields and short reaction time. In addition, the catalyst could be separated using an external magnet and is reusable many times without any significant loss of activity. تفاصيل المقالة