Synthesis 2024; 56(06): 1026-1034
DOI: 10.1055/a-2186-7116
paper
Emerging Trends in Glycoscience

Tris(pentafluorophenyl)borane-Catalyzed Stereoselective C-Glycosylation of Glycals: A Facile Synthesis of Allyl and Alkynyl Glycosides

Anand Gaurav
a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P. O. Box 173, Lucknow 226 031, India
b   Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
,
Zanjila Azeem
a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P. O. Box 173, Lucknow 226 031, India
b   Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
,
a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P. O. Box 173, Lucknow 226 031, India
b   Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
› Author Affiliations
The authors gratefully acknowledge financial support by DST-SERB (CRG/2022/003936), New Delhi, India.


Abstract

In modern advances, tris(pentafluorophenyl)borane (commonly known as BCF) catalyst has risen to prominence owing to its extensive versatility in the use of myriad of organic reactions. An efficient and highly stereoselective α-C-glycosylation strategy is presented by employing a catalytic amount of B(C6F5)3 under mild reaction conditions en route to 2,3-unsaturated C-glycosides. The reaction features a broad functional group tolerance including a variety of glycals coupled with allyltrimethylsilane and trimethylsilylphenylacetylene to access the corresponding 2,3-unsaturated allyl- and alkynyl-C-glycosides with excellent α-selectivity. The reaction proceeds in good to excellent yields via concomitant borane activation of glycal donor under mild conditions.

Supporting Information



Publication History

Received: 05 September 2023

Accepted after revision: 05 October 2023

Accepted Manuscript online:
05 October 2023

Article published online:
14 November 2023

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