%0 Journal Article %T CobaltNanoparticlesPromotedHighlyEfficientOnePotFour-ComponentSynthesisof1,4-DihydropyridinesunderSolvent-FreeConditions %A Javad SAFARI %A Sayed Hossein BANITABA %A Shiva DEHGHAN KHALILI %J ´ß»¯Ñ§±¨ %P 1850-1855 %D 2011 %R 10.1016/S1872-2067(10)60295-1 %X £¿AstraightforwardandgeneralmethodhasbeendevelopedforthesynthesisofC5-unsubstitiuted1,4-dihydropyridinesbyareactionusingdimedone,acetophenone,aromaticaldehydes,andammoniumacetateinthepresenceofacatalyticamountofConanoparticlesasaheterogeneousandeco-friendlycatalystwithhighcatalyticactivityatroomtemperatureundersolvent-freeconditions.Thiscatalystiseasilyseparatedbymagneticdevicesandcanbereusedwithoutanyapparentlossofactivityforthereaction.Inaddition,itisveryinterestingthatwhenusingConanoparticlesasacatalyst,spatially-hinderedaldehydessuchas2-methoxy-,2-fluoro-,and2-chloro-aldehydesaresuitableforthisreaction. %K cobaltnanoparticle %K 1 %K 4-dihydropyridine %K four-componentcondensation %K heterogeneoucatalyst %K magneticallyseparablecatalyst %U http://www.chxb.cn/CN/abstract/abstract20579.shtml