Applications of Shoda's reagent (DMC) and analogues for activation of the anomeric centre of unprotected carbohydrates
作者:Antony J. Fairbanks
DOI:10.1016/j.carres.2020.108197
日期:2021.1
its derivatives are useful for numerous synthetic transformations in which the anomeric centre of unprotected reducing sugars is selectively activated in aqueous solution. As such unprotected sugars can undergo anomeric substitution with a range of added nucleophiles, providing highly efficient routes to a range of glycosides and glycoconjugates without the need for traditional protectinggroup manipulations
have been synthesized directly from the corresponding unprotected sugars and dithiocarbamate salts in good yields by using 2-chloro-1,3-dimethylimidazolinium chloride (DMC) as condensing agent in aqueousmedia. The three-component one-pot synthesis of GDTCs starting from unprotected sugars, carbon disulfide, and secondary amines has also been successfully demonstrated. This is the first report on the
The first protection/deprotection-free process for radical C-glycosylation has been achieved through one-step preparable glycosyl dithiocarbamates (GDTCs). The Giese-type reaction and radical allylation of unprotected GDTCs were successfully performed to obtain the corresponding α-C-glycosides stereoselectively under mild reaction conditions.