Abstract
Acetylation reaction's product(s) of 3-[L-threo-2,3.4-trihydroxy-1-(2-naphthylhydrazono)-butyl]quinoxalin-2(1H)-one (2 b) were found to be dependent on thc reaction condition. While the tri-O-acetyl (3b) was isolated in high yield from 2b under the action of acetic anhydride/pyridine mixture. compounds 4b and 5b as well as trace of 3b were obtained when 2b was heated in acetic anhydride. On the other hand, 3-[1-(2-naphthylhydrazono)-glyoxal-1-y1]quinoxalin-2(1H)-one (7) underwent ring closure and afforded thc condensed tricyclic compound 8 under- the action of acetic anhydride/pyridine mixture.