Naskar, Gouranga published the artcileLigand-Enabled [3+2] Annulation of Aromatic Acids with Maleimides by C(sp3)-H and C(sp2)-H Bond Activation, Safety of Pyridine-3-sulfonic acid, the publication is Chemistry – A European Journal (2022), 28(39), e202200778, database is CAplus and MEDLINE.
Synthesis of tricyclic heterocyclic mols. I [R = 5-F, 5-Me, 5-CF3, etc.; R1 = Me, Et, Bn, etc.] with a free carboxylic group in a high atom- and step-economical manner via palladium-catalyzed [3+2] annulation of substituted benzoic acids with maleimides was described. The reaction proceeded via a dual C-H bond activation such as C(sp3)-H at the benzylic position and C(sp2)-H bond activation at the meta position of substituted aromatics An external ligand (MPAA) was crucial for the success of present protocol. Further, the decarboxylation and esterification of the free carboxylic acid group of observed products were carried out.
Chemistry – A European Journal 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, Safety of Pyridine-3-sulfonic acid.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem