Stereospecific generation of α- and β-glycosyl-lithium reagents from glycosyl-stannanes: a stereocontrolled route to α- and β-C-glycosides
作者:Patrick Lesimple、Jean-Marie Beau、Pierre Sinaÿ
DOI:10.1039/c39850000894
日期:——
Treatment of α- and β-D-tri-n-butylstannyl-glucopyranosides with n-butyl-lithium at –78 °C generates configurationally stable α-and β-D-glycosyl-lithium species which accept electrophilies with retention of configuration.
Reduction of Olefins Using Ruthenium Carbene Catalysts and Silanes
作者:Peter I. Dalko、Janine Cossy、Candice Menozzi
DOI:10.1055/s-2005-872695
日期:——
Ruthenium carbene complexes are able to mediate reduction of olefins in the presence of trialkylsilanes. Under these reduction conditions, when kinetically favorable ring-closing metathesis is possible, a one-pot cyclization-reduction sequence can be performed.
A SINGLE-PROCESS DESULFONYLATION OF PERBENZYLATED-α- AND -β-<scp>D</scp>-GLYCOPYRANOSYL PHENYL (<i>TERT</i>-BUTYL)SULFONES
作者:Hideki Narama、Masuo Funabashi*
DOI:10.1081/car-100104861
日期:2001.4.30
Phenyl and/or tert-butyl α or β-D-glucopyranosyl sulfones were treated with lithium aluminum hydride and potassium hydroxide respectively to afford conveniently desulfonylated products (4 and 5). From the former reductive process was isolated the 2-deoxy-1,5-anhydro-D-glucitol derivative (4) as a major product and from the latter alkaline treatment was obtained the pyranoid-2-enono-δ-lactone derivative