Reinvestigation of the Synthesis of Per-benzylated Glycosylethenes: A New Result
作者:Juan Xie、François Durrat、Jean-Marc Valéry
DOI:10.1021/jo034795e
日期:2003.10.1
Addition of vinylmagnesium bromide on the perbenzylated glucono-1,5-lactone gave, after reduction with Et3SiH/BF3.Et2O, a mixture of the desired beta-C-vinyl glucoside 1 and the unexpected beta-C-but-3-enyl glucoside 3 resulting from double addition of vinylmagnesium bromide on the lactone. Similar results have been obtained with the perbenzylated galactono-1,5-lactone. This side reaction was then been explored to prepare beta-C-but-3-enyl glycosides and other beta-C-glycosyl derivatives by employing different Grignard reagents. An alternative approach to the per-benzylated glycosylethenes has been studied and compared.
Synthesis of Stable Analogues of Glyceroglycolipids
Stable C-glycosidic analogues of 2-O-(β-D-glucopyranosyl)-sn-glycerol (1a), 2-O-(β-D-galactopyranosyl)-sn-glycerol (1b), 1-O-(β-D-glucopyranosyl)-sn-glycerol (7) and their dipalmitoyl ester have been synthesised starting from the corresponding 2,3,4,6-tetra-O-benzyl-glyconolactones 9. The 2-O-derivatives 1 were obtained by methylenation of the lactone 9, reaction of the obtained glycoexoenitol 10 with
Synthesis of sugar-derived spiroaminals via lactamization and metathesis reactions
作者:Adabala Pal John Pal、Parasuraman Kadigachalam、Asadulla Mallick、Venkata Ramana Doddi、Yashwant D. Vankar
DOI:10.1039/c0ob00555j
日期:——
A series of sugar-derived spiroaminals has been synthesized by utilizing cross metathesis, ring closing metathesis and lactamization reactions as key steps from 1-C-alkylated glycosyl azides and important correlations in the spectral data between spiroaminals and their respective anomers are reported.