α-Glucosaminide synthesis: exercising stereocontrol at C1 or C2 via torsional effects or DeShong nucleophiles
作者:G Anilkumar、Latha G Nair、Lars Olsson、Jacquitta K Daniels、Bert Fraser-Reid
DOI:10.1016/s0040-4039(00)01329-0
日期:2000.9
The synthesis of α-glucosaminides may be carried out by installing synthons for the cis-related C1 and C2 functionalities in either order. When the C2 azide is installed first, α-glycosidation can be induced by using a 4,6-O-benzylidene ring to provide torsional control of anomeric selectivity. In the alternative option, the C1 linkage can be established by use of an n-pentenyl-manno-1,2-orthoester
可以通过以任一顺序安装用于顺式相关的C1和C2官能团的合成子来进行α-氨基葡萄糖苷的合成。当叠氮化物C2首次安装,α-苷化可以通过使用4,6-诱导ø -亚苄基环,以提供端基异构体选择性的扭转控制。在另一选择中,可通过使用正戊烯基-甘露糖-1,2-原酸酯建立C 1键,通过使用DeShong的高价叠氮化硅将生成的α-甘露糖苷的C 2-氧取代。