Dehydrative cyclization catalyzed by the combination of molybdenum(VI) oxides and benzoic acids: First synthesis of the antitumour substance BE-70016

Akira Sakakura, Shuhei Umemura, Rei Kondo, Kazuaki Ishihara

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The dehydrative cyclization of N-(o-hydroxybenzoyl)threonine derivative la is efficiently promoted by the combined use of molybdenum(VI) oxides and benzoic acids bearing electron-with-drawing substituents. In the presence of ammonium molybdate [(NH4)2MoO4, 10 mol%] and penta-fluorobenzoic acid (C6F5CO2H; 10 mol%), dehydrative cyclization of la was conducted in toluene under azeotropic reflux conditions to give 2-(o-hydroxyphenyl)oxazoline 2a in 76% yield. Furthermore, the first total synthesis of the antitumour substance BE-70016 was achieved using the catalytic dehydrative cyclization of 1a as a key reaction.

Original languageEnglish
Pages (from-to)551-555
Number of pages5
JournalAdvanced Synthesis and Catalysis
Volume349
Issue number4-5
DOIs
Publication statusPublished - Mar 2007
Externally publishedYes

Fingerprint

Molybdenum
Benzoic acid
Benzoates
Cyclization
Oxides
Bearings (structural)
Toluene
Threonine
Derivatives
Acids
Electrons

Keywords

  • Catalysis
  • Dehydrative cyclization
  • Molybdenum(VI) oxide
  • Oxazolines
  • Pentafluorobenzoic acid

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Organic Chemistry
  • Catalysis

Cite this

Dehydrative cyclization catalyzed by the combination of molybdenum(VI) oxides and benzoic acids : First synthesis of the antitumour substance BE-70016. / Sakakura, Akira; Umemura, Shuhei; Kondo, Rei; Ishihara, Kazuaki.

In: Advanced Synthesis and Catalysis, Vol. 349, No. 4-5, 03.2007, p. 551-555.

Research output: Contribution to journalArticle

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