The synthesis of chiral (2R) 2,5‐diaryl‐2,3‐dihydropyrano[2,3‐b]quinolin‐4‐ones, was achieved, at ambient temperature, by the reaction of 3‐acetyl‐4‐aryl‐carbostyril and an aldehyde, in the presence of bismuth triflate–L(−)‐proline complex, formed in situ. The products were obtained in 62–78% yield with high enantioselectivity (72–96% ee). J. Heterocyclic Chem., (2011).
The growth of mixed crystals of Ba x Ca 1-x (IO 3 ) 4 were carried out with simple gel method. The effect of various parameters such as pH of gel solution, gel concentration, gel setting time, concentration of reactants on the growth was studied. Crystals having different morphologies and habits were obtained. The grown crystals were characterized by XRD, FT-IR, EDAX, TGA, DTA and DSC.
4-Aryldihydropyrimidinones were obtained in excellent yields via solid-phase Biginelli reaction of arylaldehydes, b-ketoester and urea, using bismuth nitrate, immobilized on Al 2 O 3 as catalyst. Subsequently, the products were converted into corresponding tetrahydropyrimidino[4,3-a]isoquinolines (69-73% yield) by one-pot regiospecific N-alkylation-annulation reaction using sodium hydride and dimethylaminopyridine.
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