Novel Carboranyl C-Glycosides for the Treatment of Cancer by Boron Neutron Capture Therapy
作者:Lutz F. Tietze、Ulrich Griesbach、Ingrid Schuberth、Ulrich Bothe、Alberto Marra、Alessandro Dondoni
DOI:10.1002/chem.200390148
日期:2003.3.17
The synthesis of the novel unprotected carboranylC-glycosides 2 and 20-24 starting from ethynyl C-glycosides 1, 5-8, 10, and 13 is described. The new compounds are highly water-soluble and display only a very low cytotoxicity, which makes them promising candidates for use in boronneutroncapturetherapy for the treatment of cancer.
Sequential Norrish Type II Photoelimination and Intramolecular Aldol Cyclization of α-Diketones: Synthesis of Polyhydroxylated Cyclopentitols by Ring Contraction of Hexopyranose Carbohydrate Derivatives
作者:Dimitri Alvarez-Dorta、Elisa I. León、Alan R. Kennedy、Angeles Martín、Inés Pérez-Martín、Concepción Riesco-Fagundo、Ernesto Suárez
DOI:10.1002/chem.201301230
日期:2013.7.29
nono‐2,3‐diulose derivatives by irradiation with visible‐light initiates a sequential Norrish type II photoelimination and aldol cyclization process that finally gives polyfunctionalized cyclopentitols. The rearrangement has been confirmed by the isolation of stable acyclic photoenol intermediates that can be independently cyclized by a thermal 5‐(enolexo)‐exo‐trig uncatalyzed aldol reaction with high diastereoselectivity
Ring-Closing Alkyne Metathesis in the Synthesis of Alkyne-Linked Glycoamino Acids
作者:Floris van Delft、Floris Rutjes、Stan Groothuys、S. van den Broek、Brian Kuijpers、Maarten IJsselstijn
DOI:10.1055/s-2007-990920
日期:2008.1
Synthesis of alkyne-linked glycoamino acids via ring-closing alkyne metathesis is investigated. Two different strategies are described to attach alkynylamino acids to an alkynyl sugar, either via a linker at O-4 or at O-9 of the alkynyl sugar. Ring-closing alkyne metathesis of the O-4 linked diynes failed to proceed, but alkyne-linked glycoamino acids of different chain length were effectively synthesized via attachment at O-9.