Glucopyranosylidene-spiro-iminothiazolidinone, a new bicyclic ring system: Synthesis, derivatization, and evaluation for inhibition of glycogen phosphorylase by enzyme kinetic and crystallographic methods

Katalin Czifrák, András Páhi, Szabina Deák, Attila Kiss-Szikszai, Katalin E. Kövér, Tibor Docsa, Pál Gergely, Kyra Melinda Alexacou, Maria Papakonstantinou, Demetres D. Leonidas, Spyros E. Zographos, Evangelia D. Chrysina, László Somsák

Research output: Article

6 Citations (Scopus)

Abstract

The reaction of thiourea with O-perbenzoylated C-(1-bromo-1-deoxy-β-d- glucopyranosyl)formamide gave the new anomeric spirocycle 1R-1,5-anhydro-d- glucitol-spiro-[1,5]-2-imino-1,3-thiazolidin-4-one. Acylation and sulfonylation with the corresponding acyl chlorides (RCOCl or RSO2Cl where R = tBu, Ph, 4-Me-C6H4, 1- and 2-naphthyl) produced the corresponding 2-acylimino- and 2-sulfonylimino-thiazolidinones, respectively. Alkylation by MeI, allyl-bromide and BnBr produced mixtures of the respective N-alkylimino- and N,N′-dialkyl-imino-thiazolidinones, while reactions with 1,2-dibromoethane and 1,3-dibromopropane furnished spirocyclic 5,6-dihydro-imidazo[2,1-b]thiazolidin-3-one and 6,7-dihydro-5H-thiazolidino[3,2- a]pyrimidin-3-one, respectively. Removal of the O-benzoyl protecting groups by the Zemplén protocol led to test compounds most of which proved micromolar inhibitors of rabbit muscle glycogen phosphorylase b (RMGPb). Best inhibitors were the 2-benzoylimino- (Ki = 9 μM) and the 2-naphthoylimino-thiazolidinones (Ki = 10 μM). Crystallographic studies of the unsubstituted spiro-thiazolidinone and the above most efficient inhibitors in complex with RMGPb confirmed the preference and inhibitory effect that aromatic (and especially 2-naphthyl) derivatives show for the catalytic site promoting the inactive conformation of the enzyme.

Original languageEnglish
Pages (from-to)4028-4041
Number of pages14
JournalBioorganic and Medicinal Chemistry
Volume22
Issue number15
DOIs
Publication statusPublished - aug. 1 2014

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry

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