These common heterocyclic compound, 5049-61-6, name is Pyrazin-2-amine, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route. Safety of Pyrazin-2-amine
Method B. To a suspension of 2-aminopyrazine (3 g, 31.6 mmol) in acetonitrile (50 mL) was added N-chloro-N-methoxy-4-methylbenzenesulfonamide (TSA, 8.2 g,34.7 mmol) in batches at room temperature. The reaction mixture was heated at 40 C for 4 h. Subsequently, the solvent was evaporated in vacuum and the residue was partitioned between ethyl acetate (50 mL) and saturated aqueous Na2CO3solution (20 mL). The organic layer was dried over anhydrous Na2SO4,decolorized with activated charcoal (0.8 g), and concentrated. The crude product containing ~ 5% dichlorinated impurity judged by TLC was purified by chromatography on silica gel eluting with PE/EA (10:1-2:1) to give a light-yellow solid (3.3 g, yield 80%).
The synthetic route of Pyrazin-2-amine has been constantly updated, and we look forward to future research findings.
Reference:
Article; Guo, Qi; Xu, Mingshuo; Guo, Shuang; Zhu, Fuqiang; Xie, Yuanchao; Shen, Jingshan; Chemical Papers; vol. 73; 5; (2019); p. 1043 – 1051;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem