Sodium Ascorbate as Green and Efficient Catalyst for Knoevenagel Condensation of Aryl Aldehydes with Meldrum’s Acid in Aqueous Media

2013 ◽  
Vol 8 (3) ◽  
pp. 191-198 ◽  
Author(s):  
Hamzeh Kiyani ◽  
Fatemeh Ghorbani
Keyword(s):  
Knoevenagel Condensation ◽  
Aqueous Media ◽  
Sodium Ascorbate ◽  
Meldrum's Acid ◽  
Meldrum’S Acid ◽  
Efficient Catalyst ◽  
Aryl Aldehydes

scholarly journals L-Tyrosine as an Eco-Friendly and Efficient Catalyst for Knoevenagel Condensation of Arylaldehydes with Meldrum’s Acid in Solvent-Free Condition under Grindstone Method

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
G. Thirupathi ◽  
M. Venkatanarayana ◽  
P. K. Dubey ◽  
Y. Bharathi Kumari
Keyword(s):  
Room Temperature ◽  
Knoevenagel Condensation ◽  
Solvent Free ◽  
Meldrum's Acid ◽  
Meldrum’S Acid ◽  
Efficient Catalyst ◽  
Free Condition ◽  
Solvent Free Condition ◽  
Active Methylene ◽  
Methylene Group

We investigate L-Tyrosine as an efficient catalyst for the Knoevenagel condensation of arylaldehydes with meldrum’s acid containing cyclic active methylene group in solvent-free condition under grindstone method at room temperature to produce substituted-5-benzylidene-2,2-dimethyl-[1,3]dioxane-4,6-diones 3(a–j).

Knoevenagel Condensation of Aldehydes with Meldrum's Acid in Ionic Liquids

2009 ◽  
Vol 39 (14) ◽  
pp. 2605-2613 ◽  
Author(s):  
Daryoush Tahmassebi ◽  
Levi J. A. Wilson ◽  
Jerod M. Kieser
Keyword(s):  
Ionic Liquids ◽  
Knoevenagel Condensation ◽  
Meldrum's Acid ◽  
Meldrum’S Acid

Ionic Liquid–Mediated Knoevenagel Condensation of Meldrum's Acid and Aldehydes

2006 ◽  
Vol 36 (20) ◽  
pp. 3043-3051 ◽  
Author(s):  
Nitin B. Darvatkar ◽  
Amol R. Deorukhkar ◽  
Sachin V. Bhilare ◽  
Manikrao M. Salunkhe
Keyword(s):  
Ionic Liquid ◽  
Knoevenagel Condensation ◽  
Meldrum's Acid ◽  
Meldrum’S Acid

Synthesis of functionalized chromones through sequential reactions in aqueous media

2014 ◽  
Vol 12 (30) ◽  
pp. 5757-5765 ◽  
Author(s):  
Saber Mehrparvar ◽  
Saeed Balalaie ◽  
Mahnaz Rabbanizadeh ◽  
Frank Rominger ◽  
Elmira Ghabraie
Keyword(s):  
Aqueous Media ◽  
Efficient Synthesis ◽  
Meldrum's Acid ◽  
Primary Alcohols ◽  
Meldrum’S Acid ◽  
Synthesis Protocol ◽  
Sequential Reactions

An efficient synthesis protocol has been developed for diversity-oriented functionalized compounds via four-component reaction of chromone carbaldehydes, Meldrum's acid, 4-hydroxyl coumarin or 6-methyl-4-hydroxyl-pyrone and primary alcohols in aqueous media.

scholarly journals Composite of bentonite and cyclodextrin as an efficient catalyst for promoting chemical transformations in aqueous media

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fatemeh Koohestani ◽  
Samahe Sadjadi ◽  
Majid Heravi
Keyword(s):  
Catalytic Activity ◽  
Knoevenagel Condensation ◽  
Aqueous Media ◽  
Bentonite Clay ◽  
Chemical Transformations ◽  
Elemental Mapping ◽  
Efficient Catalyst ◽  
Metal Free ◽  
Excellent Activity ◽  
Mapping Analysis

AbstractCombining the encapsulating capability of cyclodextrin and instinctive features of bentonite clay, a versatile metal free catalyst has been developed that could promote various chemical reactions such as Knoevenagel condensation, synthesis of xanthan and octahydroquinazolinones in aqueous media under ultrasonic irradiation. To prepare the catalyst, bentonite was Cl-functionalized and then reacted with isatin and guanidine successively to furnish amino functionalized bentonite. The latter then reacted with tosylated cyclodextrin. The resultant catalytic composite was characterized via XRD, SEM, EDS, BET, elemental mapping analysis, TGA and FTIR. The catalytic activity tests approved excellent activity of the catalyst as well as broad substrate scope. Notably, the catalyst could be simply recovered and reused for several reaction runs. Moreover, the activity of the composite was superior to that of its components.

scholarly journals Synthesis of benzodiazepines catalyzed by CoFe2O4@SiO2-PrNH2 nanoparticles as a reusable catalyst

2017 ◽  
Vol 72 (7) ◽  
pp. 497-503 ◽  
Author(s):  
Naiereh Sadat Miri ◽  
Javad Safaei-Ghomi
Keyword(s):  
Catalyst Loading ◽  
Reusable Catalyst ◽  
Meldrum's Acid ◽  
Meldrum’S Acid ◽  
Reaction Conditions ◽  
Efficient Catalyst ◽  
Wide Range ◽  
Low Catalyst Loading

AbstractCoFe2O4@SiO2-PrNH2 nanoparticles have been used as an efficient catalyst for the preparation of benzodiazepines by multi-component reactions of 1,2-phenylenediamine, dimedone, different aldehydes or Meldrum’s acid and isocyanides. This method provides several advantages including mild reaction conditions, the applicability to a wide range of substrates, the reusability of the catalyst and low catalyst loading.

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