Application of 768-05-8, A common heterocyclic compound, 768-05-8, name is Pyrazinoic acid hydrazide, molecular formula is C5H6N4O, 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.
A solution of 4-[(2,4-dichlorophenyl)carbonyl]-2-piperazinone (I6) (0.273 g, 1 mmol) in dry Dichloromethane (DCM) (3 ml) was stirred at room temperature under argon. Triethyloxonium tetrafluoroborate (0.199 g, 1.050 mmol) was added and the reaction solution was stirred for 10 minutes. 2-pyrazinecarbohydrazide (0.166 g, 1.200 mmol, commercially available) was then added and the solution was stirred for a further 1 hour. The solvent was then concentrated before n-butanol (3.00 ml) was added and the solution was stirred, under reflux and argon, for 4 hours. LCMS confirmed product location, thus the solution was cooled to room temperature before the solvent was evaporated in vacuo. The remaining residue was then purified by flash chromatograpghy (Biotage SP4, 25M cartridge) with a gradient of 0 to 10% 2M NH3/MeOH in DCM. TLC confirmed product location and the solvent from the combined fractions was evaporated in vacuo. The remaining residue was then further purified by mass-directed automated HPLC. The solvent was then evaporated in vacuo, and the remaining solid was triturated with ether, and dried in a vacuum oven to yield the product in 0.137 g.LCMS: m/z = 375 (M+ H)+, retention time = 0.83 minutes (2 minutes). 1H NMR (500 MHz; d6-DMSO) delta 9.37 (1 H, d), 8.75 (1 H, m), 8.74 (1 H, m), 7.79 (1 H, d), 7.61 (1 H, d), 7.57 (1 H, dd), 5.27 (1 H, d), 4.94 (1 H, d), 4.47 (1 H, m), 4.38 (1 H, m), 3.69 (2H, m).
The synthetic route of 768-05-8 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; GLAXO GROUP LIMITED; DEAN, David Kenneth; MUNOZ-MURIEDAS, Jorge; SIME, Mairi; STEADMAN, Jon Graham Anthony; THEWLIS, Rachel Elizabeth Anne; TRANI, Giancarlo; WALTER, Daryl Simon; WO2010/125102; (2010); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem