In the present work, the synthesis
of acetylated salicins, which
occur naturally in many Salicaceae species,
is reported. The preparation of 2-O-acetylsalicin,
2-O-acetylchlorosalicin, and 2-O-acetylethylsalicin from peracetylated bromosalicin with selective
acid-catalyzed deacetylation and one-pot nucleophilic substitution
of bromine as the key steps is described. The base-catalyzed O-2 →
O-6 acetyl migration afforded 6-O-acetylsalicin derivatives
in good yields. Thus, the first synthesis of 6-O-acetylsalicin
(fragilin) using acetyl group migration is reported as well as the
synthesis of 6-O-acetylchlorosalicin and 6-O-acetylethylsalicin. The NaOMe-catalyzed deacetylation
of acetylated glycosides gave salicin, chlorosalicin, and ethylsalicin
recently reported from Alangium chinense.
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