35 research outputs found
Studies on chromone derivatives: Microwave assisted 1,3-dipolar cycloaddition reactions of 4-oxo-1-benzopyran-3-carboxaldehyde imine oxides
101-10
Zeolite-HY : A selective and efficient catalyst for the synthesis of amides under microwave irradiations
725-72
Metallic bismuth and aluminium: New and efficient catalysts for the preparation of various amides
257-259A new and efficient method
for the preparation of various
amides has been achieved by a
simple reaction of an acid chloride
with primary and secondary
amines in the presence of bismuth or
aluminium powder in anhydrous toluene.</span
An efficient synthesis of 1,5-benzodiazepines catalysed by GaCl₃ under solvent free conditions
1463-1466Various 1,5-benzodiazepine derivatives have been synthesized from o-phenylenediamines and ketones using catalytic amount of GaCl₃ (5 mol%) under solvent free conditions. This method is facile, efficient, environmentally benign and affords 1,5-benzodiazepines in excellent yield
Microwave enhanced, solvent free green protocol for the production of 3,4-dihydropyrimidine-2-(1<i style="">H</i>)-ones using AlCl<sub>3</sub>.6H<sub>2</sub>O as a catalyst
360-3633,4-Dihydropyrimidine-2-(1H)-ones are synthesized via a
multicomponent reaction of aldehyde, urea or thiourea and 1,3-dicarbonyl
compounds using microwave irradiation catalyzed by 10 mol% AlCl3.6H2O
under solvent-free conditions. The catalyst being reported here is cheap, safe
to handle and the whole procedure is eco-friendly
ZnO Nanoparticles: An efficient green reusable catalyst for the synthesis of 3-formyl benzopyranones chalcones by Claisen-Schmidt reaction under solvent-free condition
1350-1354An efficient
environmentally benign protocol is reported for the production of benzopyranes
based chalcones. In this protocol, yield is very high, reaction time is very
small, work up is very simple, catalyst can be recycled, and it is free of any
hazardous by-product formation during workup
Pyrido[2,3-<i style="mso-bidi-font-style:normal">d</i>]pyrimidines: A novel tandem Michael cyclization of 6-aminouracils with arylidenecyanoacetate using BiCl<sub>3</sub>
728-7321,3-Dimethyl-2,4,7-trioxo-5-aryl-1,2,3,4,7,8-hexahydropyrido[2,3-d]pyrimidine-6-carbonitriles have been
synthesized via tandem
Michael-Cyclization of 6-aminouracils with arylidene ethylcyanoacetates
employing catalytic amount of BiCl3. Under mild reaction conditions,
pyrido[2,3-d]pyrimidines have been
obtained in very good yields in one pot
Uncatalysed Knoevenagel condensation of 3-formylchromones in green media: Polyethylene glycol - 400 (PEG-400)
1743-1748An efficient, rapid and environmentally
benign method for the Knoevenagel condensation of 3-formylchromones with a
variety of active methylene compounds in polyethylene glycol 400 (PEG-400)
under microwave irradiation (MWI) has been developed. This protocol has been
found to be applicable for condensation of pharmacologically active
heterocyclics such as rhodanine, creatinine, pyrazol-5-one, barbituric acid, etc. with 3-formylchromones
Cobalt (II) chloride or manganese (II) chloride or tin (II) chloride promoted one pot synthesis of dihydropyrimidin-2(1<i style="">H</i>)-ones using microwave irradiation
762-767Various
substituted 3, 4-dihydropyrimidin-2(1H)-ones
have been synthesized in a one pot reaction of -ketoesters, aldehydes and
urea using cobalt chloride hexahydrate or manganese chloride tetrahydrate or
tin chloride dihydrate under microwave irradiation in excellent yields without
the addition of any proton source or any additive and without any side
reactions as observed by Biginelli and others