These common heterocyclic compound, 33332-29-5, name is 2-Amino-5-chloropyrazine, 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. Application In Synthesis of 2-Amino-5-chloropyrazine
General procedure: Sodium nitrite (3.4 g, 50 mmol, 1.3 eq.) was added in small portionsto 98% sulfuric acid (15 mL) ice bath, and the mixture was allowed towarm up and heated to 60. When getting clear, the solution wascooled in an ice bath again. A solution of 2-amino-pyrazine (9) (4 g,39.3 mmol, 1 eq.) in 98% sulfuric acid (15 mL) was added dropwise.The reaction mixture was stirred at 40 for 1 h. After cooling to roomtemperature, it was slowly poured onto crushed ice and stirred until nonitrogen run out. The solution was adjusted to pH 6 with a 40% solutionof sodium hydroxide, resulting in lots of sodium sulfate which wasfiltered off whereafter. The filtrate was extracted with EA (50 mL×3),and the combined organics were dried (Na2SO4), filtered and concentratedin vacuo to give the product as a white precipitate (6.38 g,53%).
The synthetic route of 2-Amino-5-chloropyrazine has been constantly updated, and we look forward to future research findings.
Reference:
Article; Guo, Shuang; Xu, Mingshuo; Guo, Qi; Zhu, Fuqiang; Jiang, Xiangrui; Xie, Yuanchao; Shen, Jingshan; Bioorganic and Medicinal Chemistry; vol. 27; 5; (2019); p. 748 – 759;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem