In the chemical reaction process, reaction time, type of solvent, can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product. An updated downstream synthesis route of 274-79-3 as follows. 274-79-3
To a solution of imidazo[1,2-a]pyrazine (intermediate C) (2.8 g, 23.5 mmol) in AcOH (acetic acid) (200 ml) was added bromine (6 ml, 5 eq.) via addition funnel, with the reaction flask protected from light. After addition, the flask was sealed. The mixture was stirred at rt for 24 hr., 6 ml (5 eq.) of additional Br2 was added to the reaction mixture, which was further stirred at rt for 48 hr. The mixture was evaporated to remove Br2 and acetic acid, and the residue was dissolved in 10% IPA/DCM, washed with sat. Na2CO3 (300 ml). The organics were combined, dried and concentrated to afford 5.9 g (yield 97%) of 3,5-dibromo-imidazo[1,2-a]pyrazine. 1H-NMR (400 MHz, DMSO-d6) delta 9.05 (s, 1H), 8.09 (s, 1H), 7.99 (s, 1H). MS m/z 278 [M++1].
According to the analysis of related databases, 274-79-3, the application of this compound in the production field has become more and more popular.
Reference:
Patent; Sugen, Inc.; US2004/220189; (2004); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem