摘要
A facile method for the carbonylative cycliza- tion of o-bromobenzoic acid with primary amine using Pd（OAC）2 as a metal precursor and 1, l′-bis（diphenylpho- sphino）ferrocene （dppf） as a ligand has been developed. The effect of various reaction parameters such as ligand, solvent, base, time and temperature on this cyclization was studied. The optimized protocol was used for a wide variety of substituted aryl amines with different steric and electronic properties, affording the corresponding isoindoline-l,3-diones in good to excellent yields under atmospheric pressure of carbon monoxide at 100℃ within 10h using 1,4-diazabicyclo[2.2.2]octane （DABCO） as a base. The reaction system finds attractive alternative to the conventional multistep synthetic process and thus repre- sents an effective utilization of carbonylative protocol for synthesis of valuable chemicals.
A facile method for the carbonylative cycliza- tion of o-bromobenzoic acid with primary amine using Pd（OAC）2 as a metal precursor and 1, l′-bis（diphenylpho- sphino）ferrocene （dppf） as a ligand has been developed. The effect of various reaction parameters such as ligand, solvent, base, time and temperature on this cyclization was studied. The optimized protocol was used for a wide variety of substituted aryl amines with different steric and electronic properties, affording the corresponding isoindoline-l,3-diones in good to excellent yields under atmospheric pressure of carbon monoxide at 100℃ within 10h using 1,4-diazabicyclo[2.2.2]octane （DABCO） as a base. The reaction system finds attractive alternative to the conventional multistep synthetic process and thus repre- sents an effective utilization of carbonylative protocol for synthesis of valuable chemicals.
