10.1016/j.carres.2010.12.001
The research focuses on the synthesis of C-glycosylated amino acids through the hetero-Diels–Alder addition of ethyl 2-nitrosoacrylate to exo-glycals. The main goal is to prepare C-glycoamino acids, which are stable mimics of glycosylated amino acids, potentially useful in biological studies and therapeutics. The experiments involve a series of chemical reactions, including cycloaddition, reduction, protection, and hydrogenolytic cleavage, to convert spirocyclic oxazines into C-glycosylated products. Key reactants include ethyl 2-nitrosoacrylate, exo-glycals, and various reagents for subsequent transformations. Analytical techniques used to characterize the synthesized compounds include optical rotation, NMR spectroscopy, FTIR spectroscopy, and high-resolution mass spectrometry, which confirm the structure and purity of the products obtained from each step of the synthesis.