New access to the one-pot solvent-free synthesis of 4,5-dihydro-pyrido[2,3-b][1,4]diazepines and 2,3-dihydro-benzo[b][1,4]diazepines by microwave irradiation

2009 ◽  
Vol 46 (5) ◽  
pp. 861-865 ◽  
Author(s):  
Shyamaprosad Goswami ◽  
Anita Hazra ◽  
Subrata Jana
Keyword(s):  
Microwave Irradiation ◽  
Solvent Free ◽  
One Pot ◽  
The One ◽  
Solvent Free Synthesis

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.

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 Superparamagnetic Iron Oxide as an Efficient Catalyst for the One-Pot, Solvent-Free Synthesis of 5,5-Disubstituted Hexahydropyrimidines and Their Spiro Analogues

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Fatemeh Janati ◽  
Majid M. Heravi ◽  
Ahmad Mirshokraie
Keyword(s):  
Iron Oxide ◽  
Superparamagnetic Iron Oxide ◽  
Solvent Free ◽  
One Pot ◽  
Efficient Catalyst ◽  
External Magnet ◽  
The One ◽  
Short Time ◽  
Solvent Free Synthesis

Superparamagnetic Fe3O4is shown to act as a very efficient catalyst for the one-pot, three-component synthesis of 5,5-disubstituted hexahydropyrimidines and their spiropiperidines. The catalyst is easily recovered by the use of an external magnet and reused in several reactions without any noticeable loss of activity. The products are obtained in short time and good purity upon separation of the catalyst and evaporation of the volatiles of the reaction mixture.

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