Sugar-oligoamides: synthesis of DNA minor groove binders

J Org Chem. 2012 Dec 7;77(23):10870-81. doi: 10.1021/jo302238u. Epub 2012 Nov 16.

Abstract

Sugar-oligoamides have been designed and synthesized as structurally simple carbohydrate-based ligands to study carbohydrate-minor groove DNA interactions. Here we report an efficient solution-phase synthetic strategy to obtain two broad families of sugar-oligoamides. The first type, structure vector A (-Py[Me]-γ-Py-Ind), has a methyl group present as a substituent on the nitrogen of pyrrole B, connected to the C terminal of the oligoamide fragment. The second type, structure vector B (-Py[(CH(2))(11)OH]-γ-Py-Ind), has an alkyl chain present on the nitrogen of pyrrole B connected to the C terminal of the oligoamide fragment and has been designed to access to di- and multivalent sugar-oligoamides. By using sequential DIPC/HOBt coupling reactions, the oligoamide fragment -Py[R]-γ-Py-Ind has been constructed. The last coupling reaction between the anomeric amino sugar and the oligoamide fragment was carried out by activating the acid derivative as a BtO- ester, which has been performed by using TFFH. The isolated esters (BtO-Py[R]-γ-Py-Ind) were coupled with selected amino sugars using DIEA in DMF. The synthesis of two different selective model vectors (vector A (1) and vector B (2)) and two types of water-soluble sugar-oligoamide ligands, with vector A structure (compounds 3-7) and with vector B structure (compound 8), was carried out.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amides / chemical synthesis*
  • Amides / chemistry*
  • Amino Acid Sequence
  • Carbohydrates / chemical synthesis
  • Carbohydrates / chemistry
  • DNA / chemistry*
  • Ligands
  • Magnetic Resonance Spectroscopy
  • Molecular Structure
  • Pyrroles / chemistry*

Substances

  • Amides
  • Carbohydrates
  • Ligands
  • Pyrroles
  • DNA