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Sugar unsaturated

Dihydroxylation of chain-extended unsaturated carbohydrates gives rise to higher sugars. Unsaturated ester 46 is available from glucose by a Wittig reaction in dioxane (O Scheme 16) [133]. Dihydroxylation of 46 affords a 5 1 mixture of two diastereomers and the major isomer is isolated by crystallization as the octonolactone 47 [134]. Interestingly, the two-step procedure can be converted into a one-pot transformation in dioxane by performing the... [Pg.197]

Other deoxy sugars - Unsaturated sugars 1-enes... [Pg.1215]

As would be expected, asymmetric induction decreased with distance from the sugar ring in epoxidation of the amino sugar unsaturated glycosides shown in Scheme 73 ... [Pg.19]

Radical reactions have been further utilised in the construction of branched-chain sugars. Unsaturated iodide (24) with allyltributyltin or Bu3SnH and methyl acrylate has afforded the doubly-branched derivatives (25) and (26) by way of intra- and then inter-molecular radical processes. Similarly, bromide (27) gave the 3-C-allyl derivative (28) which, after transformation into enal (29), underwent a further radical cyclisation (Scheme... [Pg.165]

See other pages where Sugar unsaturated is mentioned: [Pg.538]    [Pg.576]    [Pg.519]    [Pg.550]    [Pg.474]    [Pg.1301]    [Pg.369]    [Pg.371]    [Pg.373]    [Pg.375]    [Pg.377]    [Pg.379]    [Pg.381]    [Pg.383]    [Pg.385]    [Pg.387]    [Pg.389]    [Pg.391]    [Pg.393]    [Pg.395]    [Pg.397]    [Pg.399]    [Pg.401]    [Pg.403]    [Pg.405]   
See also in sourсe #XX -- [ Pg.20 , Pg.24 ]

See also in sourсe #XX -- [ Pg.20 ]

See also in sourсe #XX -- [ Pg.20 , Pg.67 , Pg.137 ]

See also in sourсe #XX -- [ Pg.20 , Pg.24 ]

See also in sourсe #XX -- [ Pg.249 , Pg.259 ]

See also in sourсe #XX -- [ Pg.20 ]



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