A range of C2-phosphonylated sugars have been accessed through a palladium-catalyzed
Hirao cross-coupling on 2-iodoglycals using trialkylphosphites as phosphorylating
reagents. The developed conditions led to the creation of an unnatural C–P bond on
sugars and proved to be compatible with diversely protected glycals (acetyl-, benzyl-,
PMB-protected) as well as with unprotected substrates. Several monosaccharides and
one disaccharide have been synthesized by applying this methodology. Deprotection
conditions are also described.
Key words
phosphonylation - cross-coupling - 2-iodoglycals - palladium catalysis - glycoanalogues