DDQ oxidation of hydroxyisochromans and homologues
摘要:
Some hydroxyisochromans and hydroxyphthalans are tested under oxidative conditions obtaining hydroxybenzophenone derivatives. All reactions were followed by 1H NMR spectroscopy. Some final main oxidation products were also isolated and characterised.
The successful one step synthesis did not require protecting groups and provided high yields. The obtainment of 1-(4′-hydroxybenzyl)-6,7-dihydroxyisochroman (1) indicates that this protocol can be used to synthesize oxygenated analogues of benzyl-tetrahydroisoquinoline alkaloids, such as demethyl-coclaurine (2). This methodology could provide a general procedure for the synthesis of hydroxyisochromans
Some hydroxyisochromans and hydroxyphthalans are tested under oxidative conditions obtaining hydroxybenzophenone derivatives. All reactions were followed by 1H NMR spectroscopy. Some final main oxidation products were also isolated and characterised.