Hydrochloric Acid → HCID 20339428, compound

Participants

Reaction Steps

A solution of 9.0 g. of 2,3,4,4a-tetrahydro-8-trifluoromethyl-1H-pyrazino[1,2-a]quinoxalin-5(6H)-one, 18 ml. of 4-vinylpyridine and 7 ml. of acetic acid was refluxed in 250 ml. of methanol overnight. The solvent was removed and the residue was precipitated with water. The precipitate was filtered and recrystallized from ethanol-water to yield 9.2 g. of the free base, m.p. 204°-206° C. 4 G. of this free base was dissolved in ethanol and treated with dry hydrogen chloride saturated ethanol. The product hydrogen chloride salt was filtered and recrystallized once from i-propanol and once from ethanol to yield 3.4 g. of the dihydrochloride salt of the title compound, m.p. 218°-221° C.

Provenance & Evidence