Dihydropyridine C-glycoconjugates by organocatalytic Hantzsch cyclocondensation. Stereoselective synthesis of α-threofuranose C-nucleoside enantiomers
作者:Diogo R. B. Ducatti、Alessandro Massi、Miguel D. Noseda、Maria Eugênia R. Duarte、Alessandro Dondoni
DOI:10.1039/b900422j
日期:——
The Hantzsch reaction of C-glycosyl aldehyde/enamino ester/β-ketoester systems under L-proline catalysis to give dihydropyridineC-glycoconjugates is reported. Asymmetric cyclocondensations of differentially substituted enamine and β-dicarbonyl components with formyl α-L-C-threofuranoside and with the α-D-isomer were also carried out. Each reaction occurred with high yet opposite stereoselectivity (de
C-糖基醛/氨基酯/β-酮酸酯体系的Hantzsch反应。大号脯氨酸据报道催化产生二氢吡啶C-糖缀合物。还进行了不同取代的烯胺和β-二羰基组分与甲酰基α- L - C-苏糖呋喃糖苷和α- D-异构体的不对称环缩合。每个反应都以高但相反的立体选择性(de> 95%)发生,因此制备了一对α-苏呋喃糖C-核苷对映体。