Piperazine → 2-Chloro-3-(piperazin-1-yl)pyrazine

Participants

Reaction Conditions

Reaction Steps

A mixture of 2,3-dichloropyrazine (1.35 g, 15.32 mmol), piperazine (2.34 g, 27.2 mmol) and K2CO3 (1.25 g, 9.04 mmol) in acetonitrile (5.5 mL) was stirred at 110° C. for 1.25 h in a sealed tube. The reaction mixture was diluted with CH2Cl2, filtered, and concentrated to give a yellowish semisolid residue which was purified by chromatography on silica gel using CHCl3/MeOH (9:1) as eluent. The obtained solid was redissolved in CHCl3 and applied to a short (3 cm) plug of alumina. Elution with ether/CHCl3 (9:1) afforded 1.24 g (69%) of the title product as a white solid: mp 47-53° C. HRMS m/z calcd for C8H11CIN4 (M)+ 198.0672, found 198.0673.

Provenance & Evidence