Lithium Perchlorate and Lithium Bromide Catalysed Solvent Free One Pot Rapid Synthesis of 3-Carboxycoumarins under Microwave Irradiation

2002 ◽  
Vol 2002 (1) ◽  
pp. 40-41 ◽  
Author(s):  
B.P. Bandgar ◽  
L.S. Uppalla ◽  
V.S. Sadavarte
Keyword(s):  
Microwave Irradiation ◽  
Lithium Bromide ◽  
Lithium Perchlorate ◽  
Catalytic Amount ◽  
Solvent Free ◽  
Meldrum's Acid ◽  
Meldrum’S Acid ◽  
Rapid Synthesis ◽  
One Pot ◽  
Substituted Benzaldehydes

Reaction of 2-hydroxy or 2-methoxy substituted benzaldehydes or acetophenones with Meldrum's acid in the presence of a catalytic amount of LiClO4 or LiBr without solvent under microwave irradiation afforded 3-carboxycoumarins in excellent yields.

An Expeditious One-Pot Three-Component Synthesis of 4-Aryl-3,4-dihydrobenzo[g] quinoline-2,5,10(1H)-triones under Green Conditions

2020 ◽  
Vol 23 (23) ◽  
pp. 2626-2634
Author(s):  
Saiedeh Kamalifar ◽  
Hamzeh Kiyani
Keyword(s):  
Reaction Medium ◽  
Meldrum's Acid ◽  
Meldrum’S Acid ◽  
One Pot ◽  
One Pot Synthesis ◽  
Substituted Benzaldehydes ◽  
High Yields ◽  
First Time ◽  
Green Conditions

: An efficient and facial one-pot synthesis of 4-aryl-3,4-dihydrobenzo[g]quinoline- 2,5,10(1H)-triones was developed for the first time. The process proceeded via the three-component cyclocondensation of 2-amino-1,4-naphthoquinone with Meldrum’s acid and substituted benzaldehydes under green conditions. The fused 3,4-dihydropyridin-2(1H)- one-ring naphthoquinones have been synthesized with good to high yields in refluxing ethanol as a green reaction medium. This protocol is simple and effective as well as does not involve the assistance of the catalyst, additive, or hazardous solvents.

A One-Pot, Three-Component, Solvent-Free Synthesis of Novel 6H-Chromeno[3’,4’:5,6]Pyrido[2,3-d]Pyrimidine-Triones under Microwave Irradiation

2018 ◽  
Vol 42 (12) ◽  
pp. 604-607
Author(s):  
Loghman Firoozpour ◽  
Hoda Yahyavi ◽  
Ramona Ejtemaei ◽  
Setareh Moghimi ◽  
Alireza Foroumadi
Keyword(s):  
Microwave Irradiation ◽  
Efficient Method ◽  
Barbituric Acid ◽  
Reaction Times ◽  
Solvent Free ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Substituted Benzaldehydes ◽  
High Yields ◽  
Solvent Free Synthesis

A green and efficient method for preparing novel heterocyclic systems is established through the reaction of differently substituted benzaldehydes, barbituric acid and 4-amino-2H-chromene-2-one under solvent-free conditions. This method affords 6H-chromeno[3’,4’:5,6] pyrido[2,3-d]pyrimidine-trione derivatives in high yields and short reaction times.

scholarly journals Tandem Fries Reaction–Conjugate Addition under Microwave Irradiation in Dry Media; One-pot Synthesis of Flavanones

1999 ◽  
Vol 23 (9) ◽  
pp. 574-575
Author(s):  
Firouz Matloubi Moghaddam ◽  
Mohammad Ghaffarzadeh ◽  
Seyed Hossein Abdi-Oskoui
Keyword(s):  
Microwave Irradiation ◽  
Silica Gel ◽  
Conjugate Addition ◽  
Solvent Free ◽  
Naphthalene Derivatives ◽  
One Pot ◽  
Fries Rearrangement ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Fries Reaction

An AICl3–ZnCl2 mixture supported on silica gel is found to be an efficient medium for the Fries rearrangement of acyloxybenzene or naphthalene derivatives in solvent-free conditions under microwave irradiation.

Solvent-free synthesis of novel vanillidene derivatives of Meldrum's acid: biological evaluation, DNA and BSA binding study

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 39452-39459 ◽  
Author(s):  
Nenad Janković ◽  
Jovana Muškinja ◽  
Zoran Ratković ◽  
Zorica Bugarčić ◽  
Branislav Ranković ◽  
...  
Keyword(s):  
Biological Evaluation ◽  
Solvent Free ◽  
Binding Study ◽  
Meldrum's Acid ◽  
Meldrum’S Acid ◽  
Bsa Binding ◽  
Solvent Free Conditions ◽  
Derivatives Of ◽  
Solvent Free Synthesis

A series of novel O-alkyl vanillidene derivatives containing Meldrum's acid scaffold under solvent-free conditions were synthesized.

scholarly journals Solvent-free Synthesis of Nitriles from Aldehydes Catalyzed by KF/Al2O3, Montmorillonite KSF and K10

2006 ◽  
Vol 3 (3) ◽  
pp. 164-168
Author(s):  
Li-Jun Li ◽  
Ying-Xia Song ◽  
Yan-Su Gao ◽  
Yan-Feng Li ◽  
Jian-Feng Zhang
Keyword(s):  
Microwave Irradiation ◽  
Solvent Free ◽  
One Pot ◽  
Effective Catalyst ◽  
Multistep Procedure ◽  
Solvent Free Synthesis

Multistep and one-pot conversion of aldehydes to nitriles were carried out conveniently with out solvent using KF/Al2O3, montmorillonite KSF and K10 as catalyst, under microwave irradiation. The reactions are completed within 6-8 min to give satisfactory yields. KF/Al2O3was more effective catalyst both in multistep procedure and one-pot reaction.

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