Person: Liu, Richard
Loading...
Email Address
AA Acceptance Date
Birth Date
Research Projects
Organizational Units
Job Title
Last Name
Liu
First Name
Richard
Name
Liu, Richard
Search Results
Now showing 1 - 1 of 1
Publication Macrocyclic bis-thioureas catalyze stereospecific glycosylation reactions(American Association for the Advancement of Science (AAAS), 2017-01-12) Park, Yongho; Harper, Kaid; Kuhl, Nadine; Kwan, Eugene; Liu, Richard; Jacobsen, EricCarbohydrates are involved in nearly all aspects of biochemistry, but their complex chemical structures present long-standing practical challenges to their synthesis. In particular, stereochemical outcomes in glycosylation reactions are highly dependent on the steric and electronic properties of coupling partners; thus, carbohydrate synthesis is not easily predictable. Here we report the discovery of a macrocyclic bis-thiourea derivative that catalyzes stereospecific invertive substitution pathways of glycosyl chlorides. The utility of the catalyst is demonstrated in the synthesis of trans-1,2-, cis-1,2-, and 2-deoxy-β-glycosides. Mechanistic studies are consistent with a cooperative mechanism in which an electrophile and a nucleophile are simultaneously activated to effect a stereospecific substitution reaction.