A facile and convenient ultrasonic-assisted method for the synthesis of 2-sulfonyl nitrogen heterocyclics has been developed. Using bromo-tris-pyrrolidino-phosphonium hexafluorophosphate(Py Bro P) as catalyst, the reactions were carried out under ultrasound irradiation condition at room temperature for 1.0 h, and the 2-sulfonyl nitrogen heterocyclics were obtained in good yields with nitrogen heterocyclic N-oxides and sulfinic acid as raw materials. The reaction has the advantages of good substrate suitabil...
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