Hydrochloric Acid → 2,3,4,4a-Tetrahydro-1H-pyrazino(1,2a)quinoxalin-5-(6H)one

Participants

Reaction Steps

A mixture of 3.0 g. of 3carbobenzoxy-2,3,4,4 a-tetrahydro-1H-pyrazino[1,2-a]quinoxalin-5(6H)-one, 2 g. of hydrogen chloride, 3 g. of 10% palladium on carbon and 200 ml. of ethanol is hydrogenated on a Parr apparatus for 18 hours at 46 p.s.i. hydrogen pressure. The catalyst is filtered and the filtrate is concentrated. The residue is recrystallized from ethanol to give 0.55 g. of the product as the hydrogen chloride salt, m.p. 288°-290° .

Provenance & Evidence