111828-68-3Relevant academic research and scientific papers
Synthesis of Conformationally-Locked cis- and trans-Bicyclo[4.4.0] Mono-, Di-, and Trioxadecane Modifications of Galacto- and Glucopyranose; Experimental Limiting 3JH,H Coupling Constants for the Estimation of Carbohydrate Side Chain Populations and beyond
Amarasekara, Harsha,Dharuman, Suresh,Kato, Takayuki,Crich, David
, p. 881 - 897 (2018)
Hexopyranose side chains populate three staggered conformations, whose proportions can be determined from the three sets of ideal limiting 3JH5,H6R and 3JH5,H6S coupling constants in combination with the time-averaged experimental coupling constants. Literature values for the limiting coupling constants, obtained by the study of model compounds, the use of the Haasnoot-Altona and related equations, or quantum mechanical computations, can result in computed negative populations of one of the three ideal conformations. Such values arise from errors in the limiting coupling constants and/or from the population of nonideal conformers. We describe the synthesis and analysis of a series of cis- and trans-fused mono-, di-, and trioxabicyclo[4.4.0]octane-like compounds. Correction factors for the application of data from internal models (-CH(OR)-CH(OR)-) to terminal systems (-CH(OR)-CH2(OR)) are deduced from comparison of further models, and applied where necessary. Limiting coupling constants so-derived are applied to the side chain conformations of three model hexopyranosides, resulting in calculated conformer populations without negative values. Although, developed primarily for hexopyranose side chains, the limiting coupling constants are suitable, with the correction factors presented, for application to the side chains of higher carbon sugars and to conformation analysis of acyclic diols and their derivatives in a more general sense.
Highly functionalized, enantiomerically pure furo[x,y-c]pyrans via alkylidenecarbenes derived from sugar templates: synthesis and mechanism study via computational chemistry
Nguyen Van Nhien, Albert,Cordonnier, Romaric,Le Bas, Marie-Delphine,Delacroix, Sébastien,Soriano, Elena,Marco-Contelles, José,Postel, Denis
experimental part, p. 9378 - 9394 (2009/12/28)
The new method for the generation of alkylidenecarbenes based on the reaction of trimethylsilylazide/Bu2SnO with α-cyanomesylates has been applied to readily available sugar derivatives for the synthesis of highly functionalized, enantiomerical
Synthesis of 2,2-Di-C-methyl-2-deoxy- and 4,4-Di-C-methyl-4-deoxypyranosides via Michael Addition of Conjugated Enopyranosiduloses
Kawauchi, Nobuya,Sato, Ken-ichi,Yoshimura, Juji,Hashimoto, Hironobu
, p. 1433 - 1440 (2007/10/02)
Three hexopyranosides having gem-di-C-methyl group at 2- or 4-positions were synthesized by Michael addition to 2-enopyranosid-4-ulose and 3-enopyranosid-2-ulose derivatives, respectively, followed by hydroboration.A heptopyranosid-6-ulose having gem-di-C-methyl group at C-4 was also synthesized from 4-enopyranosid-6-ulose derivative in a similar way.
