Stereoselective de novo synthesis of (5R)-3,4:5,6-di-O-isopropylidene-d-ribo-hexos-5-ulo-5,2-furanose
摘要:
A concise and stereoselective de novo synthesis of the protected oxidized sugar (5R)-3,4:5,6-di-O-iso-propylidene-D-ribo-hexos-5-ulo-5,2-furanose is described. The synthetic sequence involves a stereoselective proline-catalyzed aldol reaction of an orthogonally protected L-glyceraldehyde derivative and 2,2-dimethyl-1,3-dioxan-5-one, to obtain 5-0-acetyl-6-0-benzy1-1,3-isopropylidene-L-psicose as a key intermediate, and the final product in 5 steps and 38% yield. (C) 2016 Elsevier Ltd. All rights reserved.