8-CHLORO-[1,2,4]TRIAZOLO[1,5-A]PYRAZINE Chemical Properties

Density 

1.71±0.1 g/cm3(Predicted)

storage temp. 

under inert gas (nitrogen or Argon) at 2-8°C

pka

-1.15±0.30(Predicted)

Appearance

White to off-white Solid

8-CHLORO-[1,2,4]TRIAZOLO[1,5-A]PYRAZINE Usage And Synthesis

Synthesis

The general procedure for the synthesis of 8-chloro[1,2,4]triazolo[1,5-a]pyrazine from the compound (CAS:74803-25-1) was as follows: the raw material (120 mg, 0.9 mmol) was mixed with phosphorus triclosan (5 mL), heated to 120 °C, and the reaction was carried out for 6 hours. Upon completion of the reaction, excess phosphorous trichloride was removed by vacuum concentration. The residue was diluted with ethyl acetate and washed with saturated aqueous sodium bicarbonate. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated in vacuum to afford the target compound 8-chloro[1,2,4]triazolo[1,5-a]pyrazine as a brown solid (50 mg, 36% yield), which could be used in the next reaction without further purification. Mass spectrum (electrospray ionization) m/z: 155.0 ([M+H]+).

References

[1] Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1980, p. 506 - 511
[2] Patent: US2014/154179, 2014, A1. Location in patent: Paragraph 0412; 0417

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