<i>C2</i>-Amidoglycosylation. Scope and Mechanism of Nitrogen Transfer
作者:Jing Liu、David Y. Gin
DOI:10.1021/ja026281n
日期:2002.8.1
A one-pot C2-amidoglycosylation reaction for the synthesis of 2-N-acyl-2-deoxy-beta-pyranosides fromglycals is described. Glycal donors activated by the reagent combination of thianthrene-5-oxide (11) and Tf2O, followed by treatment with an amide nucleophile and a glycosyl acceptor, lead to the formation of various C2-amidoglycoconjugates. Both the C2-nitrogen transfer and the glycosidic bond formation
Nitrogen transfer to glycals: A new method for direct C2-aza-glycosylation with glycaldonors has been developed (see scheme), employing the new reagent combination of thianthrene-S-oxide and trifluoroacetic anhydride for glycal activation, in an overall one-pot procedure.
C2-Acetamidomannosylation. Synthesis of 2-N-acetylamino-2-deoxy-α-d-mannopyranosides with glucal donors
作者:Jing Liu、Valeria Di Bussolo、David Y. Gin
DOI:10.1016/s0040-4039(03)00871-2
日期:2003.5
A one-pot C2-acetamidomannosylation reaction for the synthesis of 2-N-acetylamino-2-deoxy-α-d-mannopyranosides from glucals is described. Glucal donors are activated by the reagent combination of 2,8-dimethyldibenzothiophene-5-oxide (DMDBTO) and trifluoromethanesulfonic anhydride. Upon subsequent addition of N-(TMS)acetamide and an appropriate glycosyl acceptor, the corresponding C2-acetamidomannopyranosides