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Scientific article
English

One-pot synthesis and chiral analysis of cyclopropane derivatives

Published inChirality, vol. 17, no. 1, p. 44-50
Publication date2005
Abstract

A user-friendly, one-pot procedure was developed to access racemic as well as enantiomerically enriched cyclopropanes. Thus, the cyclopropanation of olefin (3) was performed using Meldrum's acid (4) or dimethyl malonate (5) and diacetoxyiodobenzene PhI(OAc)2 (6) or iodosyl benzene PhI=O (7) for in situ generation and decomposition of the phenyliodonium ylide 1 and 2, respectively. The reaction proceeds well with 5 mol% of achiral rhodium (II)-catalyst [Rh2(OAc)4] and a 10-fold excess of olefin affording the cyclopropane derivates 10 and 11, respectively, with high yield. The system is compatible with chiral Rh(II)-catalysts 8 and 9 and an enantiomeric excess up to 66% was achieved. An effective baseline separation of the enantiomers of the resulting cyclopropane derivatives was achieved using gas chromatography on the chiral stationary phase Chirasil-beta-dex.

Keywords
  • Asymmetric catalysis
  • Carbene
  • Chirasil-ß-Dex
  • Cyclopropane
  • Enantiomeric excess
  • Enantioselective gas chromatography
  • Rhodium complexes
  • Ylide
Citation (ISO format)
GHANEM ABDALLAH, Ashraf, ABOUL-ENEIN, Hassan Y., MULLER, Paul. One-pot synthesis and chiral analysis of cyclopropane derivatives. In: Chirality, 2005, vol. 17, n° 1, p. 44–50. doi: 10.1002/chir.20093
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ISSN of the journal0899-0042
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