2019年10月1日
Direct Addition of Amides to Glycals Enabled by Solvation-Insusceptible 2-Haloazolium Salt Catalysis
Angewandte Chemie - International Edition
- ,
- ,
- 巻
- 58
- 号
- 40
- 開始ページ
- 14115
- 終了ページ
- 14119
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1002/anie.201907129
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim The direct 2-deoxyglycosylation of nucleophiles with glycals leads to biologically and pharmacologically important 2-deoxysugar compounds. Although the direct addition of hydroxyl and sulfonamide groups have been well developed, the direct 2-deoxyglycosylation of amide groups has not been reported to date. Herein, we show the first direct 2-deoxyglycosylation of amide groups using a newly designed Brønsted acid catalyst under mild conditions. Through mechanistic investigations, we discovered that the amide group can inhibit acid catalysts, and the inhibition has made the 2-deoxyglycosylation reaction difficult. Diffusion-ordered two-dimensional NMR spectroscopy analysis implied that the 2-chloroazolium salt catalyst was less likely to form aggregates with amides in comparison to other acid catalysts. The chlorine atom and the extended π-scaffold of the catalyst played a crucial role for this phenomenon. This relative insusceptibility to inhibition by amides is more responsible for the catalytic activity than the strength of the acidity.
- リンク情報
- ID情報
-
- DOI : 10.1002/anie.201907129
- ISSN : 1433-7851
- eISSN : 1521-3773
- PubMed ID : 31392793
- SCOPUS ID : 85072018962