Li Q, Guo Z. Pondering the Structural Factors that Affect 1,2-
trans-Galactosylation: A Lesson Learnt from 3-
O-
β-Galactosylation of Galactosamine.
J Carbohydr Chem 2017;
47:347-362. [PMID:
30174372 DOI:
10.1080/07328303.2017.1406095]
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Abstract
Stereoselective formation of glycosidic bonds remains one of the most challenging topics in carbohydrate chemistry. The predominant method for stereoselective construction of 1,2-trans-glycosidic bonds is through the neighboring group participation effect (NGPE), which proved to be less successful in synthesizing Galβ(1→3)GalNAc disaccharide. The steric effect that overshadows NGPE and the impacts of substituents at the 3-O- and 2-N-positions of donors and acceptors, respectively, on this synthesis were systematically examined to lead to some practical guidelines for choosing protecting groups towards the successful synthesis of Galβ(1→3)GalNAc and similar disaccharides.
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