Synthesis 2023; 55(15): 2325-2332
DOI: 10.1055/s-0042-1752404
paper
Special Issue dedicated to Prof. David A. Evans

Improved Total Synthesis of 1,3,6-Trigalloyl-β-d-glucose from Glucose

Yann Pauvert
a   FRQNT-Center in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, 1375 av. Thérèse Lavoie-Roux, Montréal, Québec, H2V 0B3, Canada
,
b   Department of Physics, Université de Montréal, 1375 av. Thérèse Lavoie-Roux, Montréal, Québec, H2V 0B3, Canada
,
a   FRQNT-Center in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, 1375 av. Thérèse Lavoie-Roux, Montréal, Québec, H2V 0B3, Canada
› Author Affiliations
This work was supported by Natural Sciences and Engineering Research Council of Canada (NSERC) under the Discovery Grant Program (RGPIN-2019-06113) (to A. B. C.), the Canada Foundation for Innovation Leaders Opportunity Funds, by the FRQNT Centre in Green Chemistry and Catalysis Strategic Cluster Grant (RS-265155), and by the Université de Montréal.


This paper is dedicated to the memory of Prof. David A. Evans for his unparalleled mentorship and outstanding scientific contributions.

Abstract

A total synthesis of the naturally occurring 1,3,6-trigalloyl-β-d-glucose is reported. The highlights of the synthesis include a regioselective benzylation of levoglucosan, followed by a 1,6-ring opening via acetolysis. Galloyl substituents were introduced via esterification, and the mixture of anomers obtained could be fully converted into the targeted β-anomer via selective hydrazinolysis followed by activation of the anomeric position by a trichloroacetimidate of the 1′-anomeric hydroxyl group. 1,3,6-Trigalloyl-β-d-glucose and its synthetic α-anomer were obtained in an overall yield of 31% and 22%, respectively, from levoglucosan or in an overall yield of 37% of the β-isomer exclusively by recycling the α-isomer.

Supporting Information



Publication History

Received: 13 November 2022

Accepted after revision: 22 January 2023

Article published online:
27 February 2023

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