An efficient and facile ultrasonic-accelerated one-pot synthesis of N-acetyl-2-aryl-1, 2-dihydro-(4H)-3,1-benzoxazin-4-ones
作者:Davood Azarifar、Davood Sheikh
DOI:10.1002/hc.20663
日期:——
An application of ultrasonic irradiation in the one-potsynthesis of N-acetyl-2-aryl-1,2-dihydro-(4H)-3,1-benzoxazin-4-ones from the condensation reaction between aromatic aldehydes and anthranilic acid in the presence of excess amount of acetic anhydride has been explored. The reactions proceed smoothly under mild and solvent-free conditions at room temperature in the absence of any catalyst to afford
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
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.