Stereospecific Synthesis of 1,2-<i>cis</i> Glycosides by Allyl-Mediated Intramolecular Aglycon Delivery. 2. The Use of Glycosyl Fluorides
作者:Ian Cumpstey、Antony J. Fairbanks、Alison J. Redgrave
DOI:10.1021/ol016175a
日期:2001.7.1
[reaction: see text] Stereospecific 1,2-cis glycosylation of 2-O-allyl-protected glucosyl and mannosyl fluorides via a sequence of allyl isomerization, N-iodosuccinimide-mediated tethering, and intramolecular aglycon delivery (IAD) is reported. The use of fluoride as anomeric leaving group is advantageous in that tethering efficiencies can be increased for hindered aglycon alcohols by the use of extended reaction
Allyl Protecting Group Mediated Intramolecular Aglycon Delivery (IAD) of Glycosyl Fluorides
作者:Ian Cumpstey、Antony J. Fairbanks、Alison J. Redgrave
DOI:10.1007/s007060200020
日期:2002.4.1
sequence of allyl isomerization, N-iodosuccinimide mediated tethering, and intramolecularaglycondelivery (IAD). Fluoride is advantageous as an anomeric leaving group since extended reaction times can be employed to tether hindered aglycon alcohols without competitive anomeric activation. Tin(II) chloride mediated intramolecular glycosylation furnishes the desired α-glucosides and β-mannosides in an