20 research outputs found
Ultrasound assisted one-pot synthesis of 12-aryl8,9,10,12-tetrahydrobenzo[a]xanthen-11-one derivatives using chlorosulphonic acid as a catalyst under solvent-free conditions
ABSTRACT A multi component condensation of β-naphthol, aromatic aldehydes and cyclic 1,3-dicarbonyl compounds in presence of Chlorosulphonic acid (ClSO 3 H) as a catalyst to furnish 12-Aryl -8,9,10,12-tetrahydrobenzo [a]xanthen-11-ones derivatives in good to excellent yields under ultrasound and solvent free conditions at ambient temperature is described. This is an efficient and environmentally benign methodology
Synthesis of Co/Mn/Nano ZnO as an Efficient Supported Catalyst for Preparation of Tetrahydrobenzo[a]xanthene-11-one and Its Derivatives
By Using Ammonia Solution as a Catalyst a Multicomponent Reaction can be directed to Land up to Polyfunctional Pyridine or Pyran Derivatives
ABSTRACT A simple and efficient synthesis of highly functionalized pyridine or pyran derivatives using ammonia solution as a catalyst via three component condensations of aromatic aldehydes, malonitrile and thiols or aceto acetic ester at ambient temperature just by stirring in methanol is described
Heterogeneous catalyst: Silica sulfuric acid catalyzed synthesis of 9, 10-dihydro-12-aryl-8<i style="">H</i>-benzo[<img src='http://www.niscair.res.in/jinfo/Alpha.gif' border=0>]xanthen-11(12<i style="">H</i>)-one derivatives under solvent-free conditions
1532-1537Silica sulfuric acid (SSA)
as an efficient and reusable heterogeneous catalyst has been used for the
preparation of 9,10-dihydro-12-aryl-8H-benzo[]xanthen-11(12H)-one derivatives from the
three-component condensation reaction of b-naphthol, cyclic 1,3 dicarbonyl compounds and aromatic aldehydes
under solvent-free conditions in good to excellent yields and short reaction
times