Synthesis and spectroscopic studies of acetylated alkyl 1-azido-D-glucopyranosides
摘要:
On treatment with trimethylsilyl azide in the presence of boron trifluoride etherate, anomeric orthoesters undergo the exchange of one anomeric alkoxy group by an azido group to yield two epimeric mono azido derivatives (approximately 85% total yield). It was observed that both lateral N-15 nuclei in axially oriented azido groups are shielded as compared to their equatorial counterparts.
Spiroorthoesterification de sucres C-1 gem dihalogenes
作者:J.P. Praly、L. Brard、G. Descotes
DOI:10.1016/0040-4039(88)85250-x
日期:——
Treatment of the recently described 1-bromo- 2.3,4,6-tetra--acetyl- β -D-glucopyranosyl chloride with silver triflate in the presence of various alcohols allows efficient orthoesterification at the anomeric centre.