Lan, Lixin published the artcileUltrasonic-assisted synthesis of 2-sulfonyl nitrogen heterocyclic compounds, Recommanded Product: Pyridine-3-sulfonic acid, the publication is Youji Huaxue (2018), 38(2), 492-497, database is CAplus.
A facile and convenient ultrasonic-assisted method for the synthesis of 2-sulfonyl nitrogen heterocyclics has been developed. Using bromo-tris-pyrrolidino-phosphonium hexafluorophosphate (PyBroP) 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 suitability, short reaction times and high yields, which provides a efficient approach for the synthesis of 2-sulfonyl nitrogen heterocyclics and their derivatives
Youji Huaxue published new progress about 636-73-7. 636-73-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Sulfonic acid, name is Pyridine-3-sulfonic acid, and the molecular formula is C5H5NO3S, Recommanded Product: Pyridine-3-sulfonic acid.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem