Enzymic deacetylation of derivatives of 1,2-O-isoproylidene-α-d-hexofuranoses
摘要:
Enzymically catalysed, partial deacetylation of the 5,6-diacetates of 3-deoxy-1,2-O-isopropylidene-alpha-D-ribo-hexofuranose and 1,2-O-isopropylidene-alpha-D-gluco- and -allo-furanose with different substituents at C-3 (OAc, OMe, NHAc) gives the 5-acetate, which migrates rapidly to give the 6-acetate. The initial rate of deacetylation depends on the size of the 3-substituent and the configuration at C-3.
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.