Abstract
In this work, 2,3,4-tri-O-acetyl-D-glucurono-6,1-lactone has been prepared from glucuronic acid in two steps by converting it into glucuronic anhydride. In the presence of a catalytic amount of Ce(OTf)3 (10 examples) in ethyl acetate, the glucuronic anhydride provided 6.1-lactone in good to excellent yields. This lactone was used to prepare the novel glycoconjugates of peptidic fragments of arenastatin A, a sponge cytotoxic depsipeptide, and its analogues.
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