Synlett 2006(3): 0445-0449  
DOI: 10.1055/s-2006-932450
LETTER
© Georg Thieme Verlag Stuttgart · New York

Chiral Version of the Burgess Reagent and its Reactions with Epoxides

Hannes Leisch, Rachel Saxon, Bradford Sullivan, Tomas Hudlicky*
Department of Chemistry and Centre for Biotechnology, Brock University, 500 Glenridge Avenue, St. Catharines, Ontario, L2S 3A1, Canada
e-Mail: thudlicky@brocku.ca;
Further Information

Publication History

Received 2 November 2005
Publication Date:
06 February 2006 (online)

Abstract

A chiral auxiliary version of the Burgess reagent was prepared, and its reactions with epoxides were studied. Diastereomeric sulfamidates were converted to both enantiomers of protected trans-amino alcohols with ee of 84-98%.

3

The following statement appeared in a review by Lamberth (ref. 2b) published in 2000: ‘The compatibility of the Burgess reagent with many functionalities, e.g. halogens, epoxides, alkenes, alkynes, aldehydes, ketones, acetals, esters, secondary amides, makes it an attractive technique for the introduction of C-C double bonds into highly functionalized molecules.’

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We thank Prof. Travis Dudding (Brock University) for performing transition state optimization calculations (Gaussian 03) for the C 2 catalysts as well as for the menthol auxiliary. Full details of these calculations will be disclosed in an upcoming full paper.

10

We thank one of the referees for suggesting this explanation.

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Compound 18: colorless oil; [α]D 23 -48.5 (c 0.275, CHCl3). IR (film): ν = 3448, 3340, 2956, 2926, 2871, 1631, 1548, 1496, 1446, 1372, 1322, 1173, 1097, 986, 954, 917, 863, 815, 759, 700, 661, 609, 541 cm-1. 1H NMR (499 MHz, CDCl3): δ = 7.28-7.46 (m, 5 H), 7.06 (br s, 1 H), 5.76 (br s, 1 H), 5.06 (dt, J = 9.3, 2.2 Hz, 1 H), 4.80 (td, J = 11.0, 4.6 Hz, 1 H), 4.24 (ddd, J = 10.6, 8.8, 2.8 Hz, 1 H), 4.13 (ddd, J = 18.2, 10.3, 9.2 Hz, 1 H), 2.68 (br s, 1 H), 2.08 (d, J = 12.5 Hz, 1 H), 1.83-1.91 (m, 1 H), 1.67 (d, J = 12.1 Hz, 2 H), 1.32-1.51 (m, 2 H), 0.99 (q, J = 11.6 Hz, 1 H), 0.91 (d, J = 5.8 Hz, 3 H), 0.89 (dd, J = 6.8, 1.0 Hz, 3 H), 0.85 (m, 1 H), 0.76 (t, J = 6.5 Hz, 3 H). 13C NMR (126 MHz, CDCl3): δ = 160.3, 138.5, 129.1, 128.7, 126.5, 79.5, 75.0, 72.1, 47.1, 40.7, 34.1, 31.5, 26.4, 23.3, 22.4, 21.2, 16.8. HRMS: m/z calcd for C19H30N2O5S: 398.1875; found: 398.1855.

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We thank Dr. Ion Ghiviriga (NMR) and Dr. David Powell (mass spectrometry) from the University of Florida for their assistance with the structure assignment of 18. The details of these assignments will be reported in an upcoming full paper.