Copper-mediated anomeric <i>O</i>-arylation with organoboron reagents
作者:Victoria Dimakos、Jacklyn J. W. Liu、Zhenlu Ge、Mark S. Taylor
DOI:10.1039/c9ob01022j
日期:——
Copper-mediated couplings of arylboroxines with glycosyl hemiacetals furnish O-aryl glycosides via Csp2-O bond formation. The method enables the anomeric O-arylation of protected pyranose and furanose derivatives, and is tolerant of functionalized arylboroxine partners. Whereas mixtures of anomers are formed from glucopyranose, galactopyranose and arabinofuranose hemiacetals, the α-anomer is generated
De‐epimerization of Monosaccharides by Dynamic Kinetic Resolution: Ligand‐Controlled Synthesis of <i>O</i>‐Aryl‐Glycosides through Copper‐Catalyzed Cross‐Coupling
作者:Tian‐Yang Liu Hou、Yi‐Xian Li、Yue‐Mei Jia、Chu‐Yi Yu
DOI:10.1002/adsc.202300997
日期:2024.3.8
We report a strategy for stereoselective O-aryl-glycoside synthesis by copper-catalyzed cross-coupling of a variety of anomeric sugars and (hetero)aromatic iodides. Stereocontrol of the α/β selectivity can be successfully realized by slight structural modifications of the oxalic diamide ligands. Mechanistic studies indicated a dynamic kinetic resolution (DKR) reaction mechanism controlled by the ligand