Application of 4744-50-7,Some common heterocyclic compound, 4744-50-7, name is 2,3-Pyrazinecarboxylic anhydride, molecular formula is C6H2N2O3, 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.
General procedure: A solution of 3,4,5-trichloroaniline (1.96 g, 10 mmol) and acid anhydride (10 mmol) in glacial acetic acid (20 mL) was refluxed for 3 h. The solvent was removed under reduced pressure until the volume reached ca. 5 mL. After addition of 10 mL of acetic anhydride, the solution was refluxed again for 20 h. The solvent was removed under reduced pressure. The residue was neutralized by a solution of sodium bicarbonate (4%) until effervescence ceased. The precipitate obtained was washed with water, dried (P2O5) and recrystallized from an appropriate solvent.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 2,3-Pyrazinecarboxylic anhydride, its application will become more common.
Reference:
Article; Abdel-Aziz, Alaa A.-M.; Eltahir, Kamal E.H.; Asiri, Yousif A.; European Journal of Medicinal Chemistry; vol. 46; 5; (2011); p. 1648 – 1655;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem