Yan, Qiao published the artcileA Unified Approach to the Isomeric α-, β-, γ-, and δ-Carbolines via their 6,7,8,9-Tetrahydro Counterparts, Safety of 4-Amino-2-picoline, the publication is Journal of Organic Chemistry (2017), 82(8), 4328-4335, database is CAplus and MEDLINE.
α-, β-, γ-, And δ-carboline and the β-carboline alkaloid harman were prepared using the Ullman coupling of 2-iodo-2-cyclohexenone with nitropyridinyl halides followed by reductive cyclization and palladium-catalyzed aromatization as the key steps. The structures of α-, β-, γ-, and δ-carboline and harman were determined by X-ray crystallog.
Journal of Organic Chemistry 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 C10H13BrN2O2, Safety of 4-Amino-2-picoline.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem