Accessing C-1 Phosphonylated 2-Acylamino Uronic Acids via 2-Nitro-glycals
摘要:
Two approaches are described for the synthesis of 2-acylamino uronic acid glycosyl phosphonates from readily accessible D-glucal. The first approach that entailed oxidation of the C-6 hydroxyl group followed by phosphonylation of the uronate 2-nitro-glycal, resulted in the formation of the beta-L-gulo-configured phosphonate. Reversing the reaction order resulted in the exclusive formation of the beta-D-gluco-configured phosphonate. In both cases the thermodynamic 1,2-trans-di-equatorial phosphonylation product is obtained.
Stereoselective Synthesis of 2‐Deoxy‐α‐N‐Glycosides from Glycals with 1,4,2‐Dioxazol‐5‐ones
作者:Zhenpeng Shen、Guoyin Yin、Yangyang Li
DOI:10.1002/cjoc.202400224
日期:2024.9.15
The synthesis of N-glycosides has received significant attention due to their crucial role in carbohydrate chemistry. Despite considerable advancements developed in the construction of N-glycosides, methods for the stereoselective construction of 2-deoxy-α-N-glycosides are still limited. Herein, we disclosed a nickel-catalyzed hydroamination of glycals under mild conditions. This transformation could