Nano TiO2-supported Preyssler-type heteropolyacid (nanoTiO2/H14[NaP5W30O110]): an efficient and re-usable catalyst for the one-pot synthesis of N-acetyl-2-aryl-1,2-dihydro-(4H)-3,1-benzoxazin-4-ones
作者:Davood Azarifar、Seyed-Mola Khatami、Mohammad Ali Zolfigol、Davood Sheikh
DOI:10.1007/s13738-013-0242-4
日期:2013.10
loss of its activity. Graphical AbstractAn efficient procedure has been developed for one-potsynthesis of N-acyle-2-aryl-1,2-dihydro-(4H)-3,1-benzoxazin-4-ones in the presence of Preyssler-type heteropolyacid acid modified nano-sized TiO2 as catalyst. The reactions proceed smoothly at 25 °C to afford the products in high yields. The catalyst is easily separated and re-used for the next successive reactions
carbonylation reaction for the synthesis of N‐acetyl benzoxazinones has been achieved for the first time. To avoid the using of toxic and flammable CO gas, formic acid was utilized as the CO source here. This carbonylative process is conducted under mild reaction conditions with high reaction efficiency. A variety of the desired N‐acetyl benzoxazinone products were obtained in moderate to excellent yields
A Facile and Convenient Synthesis of<i>N</i>-Acetyl-2-aryl-1,2-dihydro-(4<i>H</i>)-3,1-benzoxazin-4-ones from the Reaction of Anthranilic Acid Derivatives with Aryl Aldehydes
作者:Farzad Nikpour、Davood Sheikh、Mohammad Saraji
DOI:10.1246/cl.2007.1074
日期:2007.8.5
A facile and convenient synthesis of N-acetyl-2-aryl-1,2-dihydro-(4H)-3,1-benzoxazin-4-ones has been reported by cyclization of some 2-(benzylideneamino)benzoic acids in acetic anhydride under reflux condition. High yields of the products were obtained in high purity with simple work-up.