Synthesis of Salicaceae Acetyl Salicins Using Selective Deacetylation and Acetyl Group Migration

J Nat Prod. 2020 Apr 24;83(4):888-893. doi: 10.1021/acs.jnatprod.9b00570. Epub 2020 Mar 19.

Abstract

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylation
  • Anti-Inflammatory Agents, Non-Steroidal / chemical synthesis*
  • Aspirin / chemical synthesis*
  • Catalysis
  • Molecular Structure
  • Salicaceae / chemistry
  • Salicaceae / metabolism*

Substances

  • Anti-Inflammatory Agents, Non-Steroidal
  • Aspirin