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.
Iron(II)-promoted amidoglycosylation and amidochlorination of an allal C3–azidoformate
作者:David G. Churchill、Christian M. Rojas
DOI:10.1016/s0040-4039(02)01658-1
日期:2002.9
Iron(II) halides promoted intramolecular alkene amidation in a C3-allal azidoformate. In the presence of alcohols, one-pot beta-glycosylation followed. Without added alcohol, amidochlorination occurred using FeCl2, providing an anomeric mixture of glycosyl chlorides which could be used in subsequent silver ion-mediated couplings. A 2-amido glycosyl chloride with a nitrogen-bound iron center is proposed as the glycosylating agent for the in situ amidoglycosylations with FeCl2. (C) 2002 Elsevier Science Ltd. All rights reserved.