Synlett 2022; 33(14): 1391-1398
DOI: 10.1055/a-1852-6889
cluster
Organic Chemistry in Thailand

One-Pot Synthesis of Glycosyl Chlorides from Thioglycosides Mediated by a Bromodiethylsulfonium Salt as a Mild Oxidant

Authors

  • Tianchai Chooppawa

    a   Green Chemistry for Fine Chemical Production and Environmental Remediation Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
    b   Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University Research Building, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
  • Penpicha Janprasert

    a   Green Chemistry for Fine Chemical Production and Environmental Remediation Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
  • Panuwat Padungros

    a   Green Chemistry for Fine Chemical Production and Environmental Remediation Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
    b   Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University Research Building, Phayathai Road, Pathumwan, Bangkok 10330, Thailand

This research is supported financially by Thailand Science Research and Innovation Fund Chulalongkorn University (CU_FRB65_bcg (14)_082_23_12 for P.P.). P.P. would like to thank the Chulalongkorn University Office of International Affairs Scholarship for Short-Term Research. T.C. would like to thank the Center of Excellence on Petrochemical and Materials Technology (PETROMAT) for a postdoctoral fellowship.


Graphical Abstract

Preview

Abstract

The conventional synthesis of glycosyl chlorides from thioglycosides relies on sequential oxidation and chlorination. A one-pot synthesis of glycosyl chlorides is warranted as an alternative method. Here, we report a one-pot synthesis of glycosyl chlorides from thioglycoside precursors. The transformation was mediated at low temperatures by bromodiethylsulfonium bromopentachloroantimonate (BDSB) as a mild oxidant with Bu4NCl as an additive. Armed thioglycosides afforded the corresponding α-glycosyl chlorides in moderate to good yields under the optimized conditions. Low conversions and yields were obtained when the less-reactive disarmed thioglycosides were used. Unexpectedly, BDSB-mediated oxidation of thioglycosides without the addition of Bu4NCl also afforded the α-glycosyl chlorides in moderate yields. We suggest a mechanism involving the transfer of chloride ions from the nonnucleophilic bromopentachloroantimonate (SbCl5Br) anion to the oxocarbenium ion.

Supporting Information



Publikationsverlauf

Eingereicht: 14. Februar 2022

Angenommen nach Revision: 14. Mai 2022

Accepted Manuscript online:
14. Mai 2022

Artikel online veröffentlicht:
15. Juni 2022

© 2022. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany