Graphakos, Basil J. published the artcileHeterocycles in organic synthesis. Part 13. The reaction of 2,4-diphenylthiopyrylium perchlorate with amines, Application In Synthesis of 18437-58-6, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1980), 1345-6, database is CAplus.
2,4-Diphenylthiopyrylium perchlorate (I) [30235-02-0], prepared by sequential treatment of 4,6-diphenylthiopyran-2-thione [842-62-6] with 30% H2O2 (AcOH, 40°, 2 h) and 70% HClO4, reacted with aromatic amines and aminopyridines (EtOH, 40-4°, 2 h, 20°) to give the thiopyrylium dyes II (R = aminoaryl, aminopyridyl). Thus, 52% II (R = C6H4NH2-4) [75076-63-0] was obtained from PhNH2 [62-53-3] and I. Analogous treatment of I with MeNH2 [74-89-5] (EtOH, reflux, 2 h) gave 12% 1-methyl-2,4-diphenylpyridinium perchlorate [75076-60-7] and 45% 4,6-diphenyl-2H-thiopyran [75076-61-8].
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 18437-58-6. 18437-58-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 4-Amino-2-picoline, and the molecular formula is C6H8N2, Application In Synthesis of 18437-58-6.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem