Use of the Perdeuteroallyl Protecting Group Facile and straightforward transformations of propynoic acid into perdeuterated allyl bromide are described. The advantage of the pentadeuteroallyl protection for the 1H-N.M.R. structure elucidation of complex carbohydrate derivatives is demonstrated in the 2,6-dideoxy-L-ribo-series.
De Novo Synthesis of the Trisaccharide Subunit of Landomycins A and E
作者:Maoquan Zhou、George A. O’Doherty
DOI:10.1021/ol800697k
日期:2008.6.5
A highly enantio- and diastereoselective synthesis of alpha-L-rhodinose, beta-D-olivose as well as the trisaccharide portion of landomycin A from achiral acetyl furan has been developed. The key transformations include the palladium-catalyzed glycosylation, Myers' reductive rearrangement, diastereoselective dihydroxylation, and regioselective Mitsunobu inversion. A Mitsunobu reaction on a six member ring cis-1,2-diol was found to chemoselectively discriminate between equatorial and axial alcohols and to stereoselectively convert cis-1,2-diol into ant 1,2-diol.
Sajus, Henry; Thiem, Joachim, Liebigs Annalen der Chemie, 1993, # 2, p. 211 - 214