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

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