Studies on heterocyclic compounds. XXXII. Synthesis of 8-substituted theophyllines from 6-amino-5-benzylideneamino-1,3-dimethyluracils with nickel peroxide.
efficient protectinggroup for the carbonyl moiety in sugars by the formation of the imine group. The protection reaction is carried out under mild conditions, the yields are quantitative in most of the cases, and the protectinggroup is completely recovered and reused. After per-acetylation, deprotection is accomplished at room temperature with aqueous formic acid to produce acyclic acetylated sugars in