Catalytic asymmetric epoxidation of alkenes with arabinose-derived uloses

Tony K.M. Shing, Yiu C. Leung, Kwan W. Yeung

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Four L-erythro-2-uloses were readily prepared from L-arabinose via a reaction sequence involving Fischer glycosidation, acetalization and oxidation. Bulky steric sensors at the anomeric center could enhance the stereoselectivity of the dioxirane epoxidation and one of the uloses performed with good enantioselectivity towards trans-stilbene (up to 90% ee). However, the catalysts decomposed during the epoxidation and the maximum chemical yield was only 13% under the basic conditions. Three L-threo-3-uloses could overcome the decomposition problem based on the electron withdrawing effect of the ester group(s) α to the ketone functionality. The best chemical yield was up to 93% using a ketone with two flanking ester groups. One of the improved uloses displayed moderate enantioselectivity towards trans-disubstituted and trisubstituted alkenes (40-68% ee).

Original languageEnglish
Pages (from-to)2159-2168
Number of pages10
JournalTetrahedron
Volume59
Issue number12
DOIs
Publication statusPublished - 2003 Mar 17

Keywords

  • Arabinose
  • Asymmetric epoxidation
  • Ulose

ASJC Scopus subject areas

  • Biochemistry
  • Drug Discovery
  • Organic Chemistry

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