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|Title: ||Rapid Transformation of D-Mannose into Orthogonally Protected D-Glucosamine and D-Galactosamine Thioglycosides|
|Authors: ||EMMADI, M|
|Keywords: ||ONE-POT PROTECTION|
|Issue Date: ||2011|
|Publisher: ||AMER CHEMICAL SOC|
|Citation: ||JOURNAL OF ORGANIC CHEMISTRY,76(11)4703-4709|
|Abstract: ||An expedient protocol for synthesis of orthogonally protected 2-azido-2-deoxy-D-glucosamine and 2-azido-2-deoxy-D-galactosamine donors from D-mannose is described. Readily available phenyl,beta-D-thiomannoside is rapidly transformed into D-GlcN(3) thioglycosides via a highly regioselective 3-O-acylation followed by 4,6-O-benzylidenation and azide displacement of C(2)-OTf, which is further converted into D-GalN(3) thioglycosides through Lattrell-Dax inversion of the C4 hydroxy group and its Boc protection. The reaction sequence may be completed in 2 days and involves simple workups and minimal column chromatography.|
|Appears in Collections:||Article|
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