A concise C-glycosyl amino acid synthesis by alkenyl C-glycoside–vinyloxazolidine cross-metathesis. Synthesis of glycosyl serine, asparagine and hydroxynorvaline isosteres
作者:Alessandro Dondoni、Pier Paolo Giovannini、Alberto Marra
DOI:10.1039/b106029p
日期:——
A convergent synthesis has been developed to afford C-linked glycosyl aminoacids by cross-metathesis of vinyl, allyl, and butenyl C-glycosides with N-Boc-vinyloxazolidine using the Grubbs 1,3-dimesityl-4,5-dihydroimidazol-2-ylideneruthenium carbene. The method has been employed to introduce through an α-linkage, an α-aminopentanoic acid chain at the anomeric carbon of β-D-C-gentiobiose to give a totally
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 a <i>C</i>-Glycoside Analogue of β-Galactosyl Ceramide, a Potential HIV-1 Entry Inhibitor
作者:V. Narasimharao Thota、Mula Brahmaiah、Suvarn S. Kulkarni
DOI:10.1021/jo402115w
日期:2013.12.6
A beta-C-galactosyl ceramide was synthesized in a stereoselective manner, employing a Sharpless AD reaction and olefin cross metathesis as key steps.