80796-99-2Relevant articles and documents
Enantiopure 1,4,5-trisubstituted 1,2,3-triazoles from carbohydrates: Applications of organoselenium chemistry
Bhaumik, Atanu,Samanta, Supravat,Pathak, Tanmaya
, p. 6895 - 6904 (2014/08/18)
A wide range of stable vinyl selenone-modified furanosides has been synthesized for the first time. These 2π-partners undergo 1,3-dipolar cycloaddition reactions with a wide range of organic azides to afford enantiopure trisubstituted triazoles. Furanosyl rings opened up during triazole synthesis to generate polyfunctionalized molecules, ready to undergo further transformations. This strategy is one of the most convenient methods for the synthesis of enantiopure 1,4,5-trisubstituted 1,2,3-triazoles where the chiral components are attached to C-4 or C-5 position of triazole ring. These triazoles are formed in a regioselective manner, and several pairs of regioisomeric triazoles have also been synthesized. The approach affords densely functionalized triazoles, which are amenable to further modifications because of the presence of aldehyde and hydroxyl groups. This powerful and practical route adds to the arsenals of chemists and biologists interested in the synthesis and applications of triazoles.
Synthesis of 2′,3′-didehydro-2′,3′-dideoxynucleosides by reaction of 5′-protected nucleoside 2′,3′-dimesylates with telluride dianion: A general route from cis vicinal diols to olefins
Clive, Derrick L. J.,Wickens, Philip L.,Sgarbi, Paulo W. M.
, p. 7426 - 7437 (2007/10/03)
2′,3′-Dimesylates of 5′-protected nucleosides are converted into the corresponding 2′,3′-didehydro2′,3′-dideoxy compounds by treatment with telluride dianion in the form of the sodium or lithium salt. The method is well-suited to the preparation of unsaturated nucleosides that can be converted into compounds that are believed to be useful in the treatment of AIDS. The deoxygenation is general for vicinal dimesylates that have, or may adopt, a synperiplanar conformation. With straight chain compounds the reaction is stereospecific. In some cases, similar, but slower, deoxygenations can be performed with selenide dianion.
