<i>S</i>‑Michael Additions to Chiral
Dehydroalanines as an Entry to Glycosylated Cysteines and a Sulfa-Tn
Antigen Mimic
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Abstract
Stereoselective sulfa-Michael addition
of appropriately protected
thiocarbohydrates to chiral dehydroalanines has been developed as
a key step in the synthesis of biologically important cysteine derivatives,
such as <i>S</i>-(β-d-glucopyranosyl)-d-cysteine, which has not been synthesized to date, and <i>S</i>-(2-acetamido-2-deoxy-α-d-galactopyranosyl)-l-cysteine, which could be considered as a mimic of Tn antigen.
The corresponding diamide derivative was also synthesized and analyzed
from a conformational viewpoint, and its bound state with a lectin
was studied