Nature Reviews Chemistry, volume 6, issue 11, pages 782-805

Exploiting photoredox catalysis for carbohydrate modification through C–H and C–C bond activation

Publication typeJournal Article
Publication date2022-09-21
scimago Q1
wos Q1
SJR13.441
CiteScore59.4
Impact factor51.7
ISSN23973358
General Chemistry
General Chemical Engineering
Abstract
Photoredox catalysis has recently emerged as a powerful synthetic platform for accessing complex chemical structures through non-traditional bond disconnection strategies that proceed through free-radical intermediates. Such synthetic strategies have been used for a range of organic transformations; however, in carbohydrate chemistry they have primarily been applied to the generation of oxocarbenium ion intermediates in the ubiquitous glycosylation reaction. In this Review, we present more intricate light-induced synthetic strategies to modify native carbohydrates through homolytic C–H and C–C bond cleavage. These strategies allow access to glycans and glycoconjugates with profoundly altered carbohydrate skeletons, which are challenging to obtain through conventional synthetic means. Carbohydrate derivatives with such structural motifs represent a broad class of natural products integral to numerous biochemical processes and can be found in active pharmaceutical substances. Here we present progress made in C–H and C–C bond activation of carbohydrates through photoredox catalysis, focusing on the operational mechanisms and the scope of the described methodologies. Photoredox catalysis has emerged as an indispensable platform for de novo synthesis and modification of complex biologically relevant molecules. This Review highlights photoredox-mediated C–H and C–C bond activation of carbohydrates leading to non-conventional C-functionalized sugars and rare sugar isomers.
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