Domino Process Optimized via <i>ab Initio</i> Study for an Alternative Access to Bicyclic Lactams
作者:Sébastien Comesse、Arnaud Martel、Adam Daïch
DOI:10.1021/ol2015225
日期:2011.8.5
A totally new acid-free domino process to access highly functionalized bicyclic gamma-and delta-lactams starting from commercially available and inexpensive ethoxymethylene derivatives is reported. Mechanisms elucidated by computational calculations led to new reaction conditions that boosted the yields up to 3.5 times higher.
Synthesis of a αMan(1→3)αMan(1→2)αMan Glycocluster Presented on aβ-Cyclodextrin Scaffold
作者:Clare Carpenter、Sergey A. Nepogodiev
DOI:10.1002/ejoc.200500146
日期:2005.8
β-cyclodextrins as the core component for the construction of multivalent carbohydrate structures is described. The method employed for the attachment of monomeric glycosides to a cyclodextrincore is based on the efficient nucleophilicdisplacement of bromide from an N-bromoacetamido functionality. The N-bromoacetyl group was positioned at the end of a spacer arm of glycosides and reacted with thiol groups