Selective Catalytic Strategies for Carbohydrate Synthesis

碳水化合物合成的选择性催化策略

• 批准号: 10798543
• 负责人: Alison Wendlandt
• 金额: $ 17.4万
• 依托单位: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
• 依托单位国家: 美国
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-04-01 至 2026-01-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10798543
• 关键词: Biological; Carbohydrates; Complex; Development; FDA approved; Goals; Health; Human; Isomerism; Methods; Molecular; Monosaccharides; Outcome; Pattern; Pharmaceutical Preparations; Pharmacologic Substance; Play; Polysaccharides; Reaction; Research; Resources; Role; Route; Time; bioactive natural products; carbohydrate structure; chemical synthesis; density; epimerization; functional group; human disease; pharmacophore; pyranose; scaffold; stereochemistry; sugar; tool

Project Summary Rare and unnatural carbohydrates play an essential role in the potency and selectivity of hundreds of bioactive natural products and pharmaceutical compounds. These scaffolds often feature unusual relative/absolute stereochemistry, pyranose/furanose ring branching, heteroatom substitutions, and varying degrees of deoxygenation. Despite the biological significance of rare and unnatural sugars, synthetic challenges limit access to these important molecules. Due to their functional group density and stereochemical complexity, the synthesis of rare and unnatural sugars requires multistep chemical synthesis, and commonly relies on protecting group manipulations to achieve selective reaction outcomes. New, selective methods are needed for the expedient synthesis of pyranose and furanose sugars. This proposal describes the development of selective radical reactions to transform unprotected and minimally-protected carbohydrates into diversely functionalized monosaccharides and glycans. We specifically target epimerization reactions, C-C bond forming reactions, and radical rearrangements to achieve broad synthetic access to sugar isomers, branched-chain sugars, and deoxygenated sugars, respectively. Using state-of-the-art synthetic, mechanistic and theoretical tools, our approach involves the identification of new catalytic strategies to control bond breaking, bond forming, and radical reorganization steps within the context of complex glycan molecular frameworks. The successful development of this proposed research is anticipated to transform carbohydrate synthesis, dramatically reducing the time and resources necessary to access these complex pharmacophores. Fundamental mechanistic findings revealed en route to this goal are further anticipated to contribute significantly to our understanding of carbohydrate reactivity patterns and to lay the groundwork for catalytic approaches to selective radical functionalization reactions, more broadly.

项目总结