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Ionic liquid promoted synthesis of bis(indolyl) methanes

100%
Sadaphal S., Shelke K., Sonar S., Shingare M.
Open Chemistry
|
2008
|
vol. 6
|
issue 4
622-626
EN
1-benzyl-3-methyl imidazolium hydrogen sulphate [bnmim][HSO4] was found to be an effective catalyst for the condensation reaction of indoles and derivatives with benzaldehydes in microwave irradiation with lower reaction time and higher yields to give bis(indolyl) methanes. [...]
2
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Cellulose sulphuric acid as a biodegradable and reusable catalyst for the Knoevenagel condensation

88%
Shelke K., Sapkal S., Niralwad K., Shingate B., Shingare M.
Open Chemistry
|
2010
|
vol. 8
|
issue 1
12-18
EN
A green, mild and efficient method for Knoevenagel condensation of 3-formylchromone/2-chlroquinoline-3-carbaldehyde with active methylene compounds such as Meldrum’s acid/ethyl cyanoacetate using biosupported cellulose sulphuric acid (CSA) in the solid-state by grinding under solvent-free condition has been developed. This method provides several advantages including environmental friendliness, shor t reaction times, high yields and a simple work-up procedure. Moreover, the CSA was successfully reused for four cycles without significant loss of activity. [...]
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