An unexpected course of the Meisenheimer reaction : aryl phosphates in the reaction of phosphoryl chloride with 2, 3-diphenylquinoxaline-N1-oxide.
作者:J. Nasielski、S. Heilporn、R. Nasielski-Hinkens、F. Geerts-Evrard
DOI:10.1016/s0040-4020(01)90308-4
日期:1987.1
Contrary to what is observed with other π-deficient heteroaromatic N-oxides, the reaction of 2, 3-diphenylquinoxaline-N1-oxide with OPCl3 gives only very poor yields of chlorinated quinoxalines. It is shown that the major product arises from an unprecedented attack by the nucleophilic oxygen atom of the reagent at a carbon atom of the homocycle of the O-phosphorylated N-oxide, leading ultimately to
与其他π-缺陷杂芳族N-氧化物所观察到的相反,2,3-二苯基喹喔啉-N 1-氧化物与OPCl 3的反应仅产生非常差的氯化喹喔啉收率。结果表明,主要产物来自于试剂的亲核氧原子对O-磷酸化N-氧化物的同环碳原子的空前攻击,最终导致相应的单(或二)芳基酯磷酸。使用少得多的过量的OPCl 3并用惰性溶剂稀释培养基会大大提高氯化产物的收率。