Sugar bromoimino derivatives: new sugar derivatives readily prepared from β-<scp>D</scp>-glycosyl azides
作者:Jean-Pierre Praly、Carméla Di Stéfano、László Somsák、Gérard Descotes
DOI:10.1039/c39920000200
日期:——
The treatment of two protected β-D-glycosyl azides by N-bromosuccinimide in refluxing carbon tetrachloride under free-radical conditions leads to efficient preparations of the corresponding bromoimino derivatives via an unprecedented reaction of organic azides leading, in the present case, to new sugar derivatives.
Treatment of various furanosyl and pyranosyl azides in the presence of N-bromosuccinimide in excess led to the corresponding moderately stable glycosyl bromoimines in almost quantitative yields, except for the less reactive peracetylated α-d-glucopyranosyl azide and a benzyl-protected derivative. NMR analysis and crystal structure determination showed that the C=N double bond adopted a (Z) configuration