Isobutyraldehyde → 6-Chloro-3-isopropyl-[1,2,4]triazolo[4,3-a]pyrazine

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Reaction Steps

The 2-chloro-5-hydrazinylpyrazine (0.325 g, 2.248 mmol) was suspended in DCM (4 mL) then the isobutyraldehyde (0.195 g, 2.70 mmol) was added. The mixture was stirred for about 30 min, the solvent was concentrated under reduced pressure and the solid was dissolved in DCM (4 mL). Iodobenzene diacetate (0.724 g, 2.24 mmol) was added and the solution was stirred at ambient temperature for about 2 h. The mixture was diluted with DCM (20 mL), extracted with saturated aqueous NaHCO3, dried over MgSO4, filtered and concentrated under reduced pressure. The material was purified by flash chromatography on silica gel using DCM/EtOAc (1:1) as an eluent to give the title compound (0.278 g, 63%): LC/MS (Table 1, Method g) Rt=1.74 min; MS m/z: 197.1 (M+H)+.

Provenance & Evidence