in a stereoselective and quantitative reaction. Condensation of 5-azido-5-deoxy-d-glucurono-3,6-lactone (1b) withl-cysteine methyl ester followed by the reduction of the azido group yields the rigid β-turn mimetic2d in a minimum of reaction steps.
Regioselective Conversion of the Secondary Hydroxyl Groups ofD-Glucuronic Acid without the Requirement ofO-Protecting Groups
作者:Károly Ágoston、Armin Geyer
DOI:10.1002/chem.200500515
日期:2005.10.21
Trifluoromethanesulfonic acid anhydride (triflic acid anhydride) transforms the bicyclic thiazolidinlactam 1 a into the crystalline elimination product 2, in which all four secondaryhydroxylgroups of 1 a are differently functionalized. Compound 2 can then add nucleophiles with high chemo- and stereoselectivity. Altogether, the four secondaryhydroxylgroups of D-glucuronic acid are selectively transformed
Regioselective Ring-Opening Polymerization of a Polyhydroxycarboxylic Acid for the Synthesis of a Nanoscale Carrier Material with pH-Dependent Stability and Sustained Drug Release
作者:Alexander Ewe、Anita Jansen de Salazar、Katharina Lemmnitzer、Michael Marsch、Achim Aigner、Armin Geyer
DOI:10.1002/anie.201412055
日期:2015.5.18
an attractive novel and biocompatible polymer. BICpoly nanoparticles can be loaded with low‐molecular weight drugs or coated onto surfaces as thin films. The release of loaded compounds makes BICpoly an attractive depot for drugrelease, as shown herein by loading BICpoly with dyes or the cytostatic drug doxorubicin. BICpoly is distinguishable from other polymers by its characteristic pH‐dependent degradation