Sugar chemistry without protecting groups-III. A facile chemical synthesis of 6-O-acyl-D-glycopyranoses and methyl-6-O-acyl-d-glycopyranosides.
作者:Krystyna Baczko、Daniel Plusquellec
DOI:10.1016/s0040-4020(01)80906-6
日期:——
Regioselective acylation of non protected glycopyranosides was performed using 3- acylthiazolidine-2-thiones 1 and the novel 3-acyl-5-methyl-1,3,4-thiadiazole-2(3H)-thiones 2 as the acylating reagents, yielding 6-O-acylated derivatives in high yields. Acylation of free α-D-glucose and α-D-galactose using the same conditions lead to the 6-O-acylglycoses. This reaction is compared with our previous synthesis
of sucrose fatty acid esters to undergo intramolecular migrations in organic medium and the regioselectivity of some transesterifications of sucrose were investigated by HPLC, in situ NMR spectroscopy and preparative methods. Extensive acylation on secondary positions of the glucose moiety followed by migrations is general for base catalysed transesterification. The stability of 3‐ and 6‐O‐acyl derivatives
Abstract We describe a new synthetic route to amphiphilic derivatives of naphthalene disulfonic acid which have been found to be active against HIV-1 and HIV-2. The compounds were obtained in good yield by a new efficient acylation of amino-naphthalene disulfonic acid using N-acyl-thiazolidine-2-thiones as acylating agents.
Sugar chemistry without protecting groups: a novel regioselective synthesis of 6-O-acyl-D-glucopyranoses and methyl-6-O-acyl-α--glucopyranosides
作者:Daniel Plusquellec、Krystyna Baczko
DOI:10.1016/s0040-4039(00)96390-1
日期:1987.1
hydroxyl groups of α--glucose and methyl-α--glucoside were selectively esterified by treating the free sugars with -acylthiazolidine-2-thiones, thus affording respectively 6--acyl--glucopyranoses and methyl-6--acyl-α--glucopyranosides in high yields. This new reaction is compared with our previous synthesis of 1--acyl-β--glucopyranoses from β--glucose and interpreted in terms of anomeric effect.