The synthesis of higher carbon sugars: a study on the rearrangement of higher sugar allylic alcohols
摘要:
The C12 higher sugar enone 15 (prepared from the corresponding phosphonate and aldehyde) was highly stereoselectively reduced to the D-glycero-allylic alcohol. The epimeric L-glycero-isomer was obtained by the non-selective reduction of the higher enone under Luche conditions. The separate treatment of both allylic alcohols with triflic anhydride provided the corresponding triflates, which in situ underwent allylic rearrangement with the elimination of one of the benzyl groups (from the aldehyde part of the molecule). The stereochemical aspects of this transformation are also discussed. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of the Dimethyl Ester of 1‐Deoxy‐<scp>l</scp>‐Idonojirimycin‐1‐Methylenphosphonate: A New Approach to Iminosugar Phosphonates
作者:Barbara La Ferla、Piergiuliano Bugada、Francesco Nicotra
DOI:10.1080/07328300600731990
日期:2006.5.1
1-Methylenphosphonate-1-deoxy-L-idonojirimycin (1) has been synthesized starting from commercially available tetrabenzyl glucose, the key steps being substitution of the hydroxyl group at C-5 of compound 7 with an azido group, stereoselective reaction of the aldehyde at C-1 of compound 10 with dimethyl methylenephosphonate anion, conversion of the azide into an amino group, and finally cyclization of the aminoalcohol 12.[GRAPHICS]