Amidoglycosylation via Metal-Catalyzed Internal Nitrogen Atom Delivery
作者:Elana Levites-Agababa、Elnaz Menhaji、Lisa N. Perlson、Christian M. Rojas
DOI:10.1021/ol025634k
日期:2002.3.1
[reaction: see text] Rhodium and copper acyl nitrenoids are likely intermediates in amidoglycosylation reactions of allal 3-carbamates. Iodine(III)-mediated nitrenoid formation, interaction of this species with the glycal enol ether pi-system, and highly beta-stereoselective glycosylation occur in a one-pot process that requires no additional Lewis acid activation.
Photo Amidoglycosylation of an Allal Azidoformate. Synthesis of <i>β</i>-2-Amido Allopyranosides
作者:Cindy Kan、Charli M. Long、Moushumi Paul、Christina M. Ring、Sarah E. Tully、Christian M. Rojas
DOI:10.1021/ol0069002
日期:2001.2.1
azidoformate provoked intramolecular nitrene insertion into the glycal C=C unit and allowed direct incorporation of alcohol nucleophiles as beta-disposed substituents at C-1. The 2-amido allopyranoside products were elaborated via N-acylation and selective oxazolidinone hydrolysis, providing N-Boc-protected 2-amino sugars and simplifying stereochemicalassignments. Synthesis of the potentially labile allal