Conformational recognition by central benzodiazepine receptors

Miklós Simonyi, Gábor Maksay, Ilona Kovács, Zsuzsanna Tegyey, László Párkányi, Alajos Kálmán, László Ötvös

Research output: Contribution to journalArticle

22 Citations (Scopus)


In order to distinguish conformational recognition by the receptor from steric effects brought about by substituents attached to C3 of 1,4-benzodiazepines, two series of closely related compounds were tested for binding potency. Increasing size of the 3-substituent up to isopropyl decreases both the binding and its enantioselectivity. Synthesis and X-ray determination of the molecular structure of 3,3-dimethyl derivatives possessing quasi-axial methyl substituents were followed by a mathematical separation of conformational and substituent effects for quartets with successive 3-methylation [(H)2, (S)-Me, (R)-Me, (Me)2 at C3]. Results indicate a very high preference for conformation M of the ligand by the receptor (the primary reason of stereoselectivity) and a large steric hindrance resulting from the axial methyl substituent. A lower but still unexpectedly substantial steric effect is exerted by the equatorial methyl group.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalBioorganic Chemistry
Issue number1
Publication statusPublished - Mar 1990

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Drug Discovery
  • Organic Chemistry

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