反应详情

In 1000 volume parts of ethanol is dissolved 10 parts of 2-amino-5,6-dihydroxy-3,4-dihydro-1(2H)-naphthalenone hydrobromide, followed by the addition of 100 parts of 4-methoxyphenylacetaldehyde. Using palladium-on-carbon as a catalyst, catalytic reduction is carried out at ordinary temperature and pressure. When a stoichiometric amount of hydrogen has been absorbed, the reaction mixture is filtered and the filtrate is concentrated under reduced pressure. The procedure yields 8 parts of 2-(4-methoxyphenethyl)amino-5,6-dihydroxy-3,4-dihydro-1(2H)-naphthalenone hydrobromide as colorless crystals melting at 198°-203° C.

1. customWhen a stoichiometric amount of hydrogen has been absorbed
2. filtrationthe reaction mixture is filtered
3. concentrationthe filtrate is concentrated under reduced pressure