Kanaujiya VK, Lai CH, Kandasamay J. N-nitrosamine directed stereoselective O-glycosylation reactions of 2-amino thioglycosides with NIS-TfOH.
Carbohydr Res 2025;
551:109435. [PMID:
39999612 DOI:
10.1016/j.carres.2025.109435]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2025] [Revised: 02/20/2025] [Accepted: 02/20/2025] [Indexed: 02/27/2025]
Abstract
We described here the stereoselective synthesis of O-glycosides from 2-amino thioglycosides using N-nitrosamine as the directing group. The reaction was activated by using the NIS/TfOH system in dichloromethane at -10 °C. Various sugar and non-sugar acceptors were successfully glycosylated with 2-amino 1-thioglucoside and 2-amino 1-thiogalactoside under mild reaction conditions. These reactions provided β-glycosides in good to excellent yields.
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