Zusammenfassung
Trifluoromethanesulfonic acid anhydride (triflic acid anhydride) transforms the bicyclic thiazolidinlactam 1a into the crystalline elimination product 2, in which all four secondary hydroxyl groups of 1a are differently functionalized. Compound 2 can then add nucleophiles with high chemo- and stereoselectivity. Altogether, the four secondary hydroxyl groups of (D)-glucuronic acid are selectively ...
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