Supramolecular photochirogenesis with novel cyclic tetrasaccharide: Enantiodifferentiating photoisomerization of (Z)-cyclooctene with cyclic nigerosylnigerose-based sensitizers

Cheng Yang, Wenting Liang, Masaki Nishijima, Gaku Fukuhara, Tadashi Mori, Hiroyuki Hiramatsu, Yasufumi Dan-Oh, Kazuo Tsujimoto, Yoshihisa Inoue

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Isophthalic and terephthalic acid monoesters of cyclic nigerosyl-(1→6) -nigerose (CNN), a cyclic tetrasaccharide composed of four d-glucopyranosyl residues connected by alternating α-1,3- and α-1,6-linkages, were synthesized as novel chiral supramolecular sensitizers for enantiodifferentiating photoisomerization of (Z)-cyclooctene () to planar chiral (E)-isomer (1E). Despite the saucer-shaped shallow cavity of CNN that does not immediately guarantee strong ground-state interactions with, the sensitizer-appended CNNs afforded optically active 1E in such enantiomeric excesses that are much improved than those obtained with an α-cyclodextrin analog and comparable with those obtained with a β-cyclodextrin analog. Interestingly, the enantiomeric excess values obtained were a critical function of temperature and solvent to show an inversion of the product chirality by changing the environmental variants. Nevertheless, all of the differential activation parameters calculated from the temperature-dependent enantiomeric excesses gave an excellent compensatory enthalpy-entropy relationship, indicating an operation of a single enantiodifferentiating mechanism in the present chiral photosensitization with modified CNNs. Chirality 24:921-927, 2012. © 2012 Wiley Periodicals, Inc.

Original languageEnglish
Pages (from-to)921-927
Number of pages7
JournalChirality
Volume24
Issue number11
DOIs
Publication statusPublished - 2012 Nov
Externally publishedYes

Keywords

  • chiral photochemistry
  • cyclic nigerosylnigerose
  • cyclooctene
  • enantiodifferentiating photoisomerization
  • planar chirality
  • supramolecular chemistry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Catalysis
  • Pharmacology
  • Drug Discovery
  • Spectroscopy
  • Organic Chemistry

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