反应详情

温度

100 °C

1-(2,3-Dihydro-1,4-benzodioxin-2-ylmethyl)piperazine (2.35 g, 10 mmole), 2-chloropyrazine (1.15 g, 10 mmole) and diisopropylethylamine (1.3 g, 10 mmole) were combined in 100 ml of 1-methyl-2-pyrrolidinone and heated under N2 at 100° C. for 24 hours. Upon cooling, the solvent was removed in vacuum and the residue filtered through 75 g of silica gel using chloroform as the eluent. The product-containing fractions were combined, the solvent evaporated and the residue was crystallized from methanol with addition of 4N isopropanolic HCl. A second recrystallization from methanol gave 850 mg of title compound, as the dihydrochloride salt, m.p. 248°-253° C.(d).

1. temperatureUpon cooling
2. customthe solvent was removed in vacuum
3. filtrationthe residue filtered through 75 g of silica gel
4. customthe solvent evaporated
5. customthe residue was crystallized from methanol with addition of 4N isopropanolic HCl
6. customA second recrystallization from methanol