The activation of aryl glycosyl sulfone donors has been achieved using scandium(III) triflate and has led to the selective preparation of α-mannosides resulting from a post-glycosylation anomerization.
Synthesis of C-glycopyranosyl compounds by a palladium-catalyzed coupling reaction of 1-tributylstannyl-d-glucals with organic halides
作者:Eric Dubois、Jean-Marie Beau
DOI:10.1016/s0008-6215(00)90552-4
日期:1992.4
1-Tributylstannyl-D-glucals, prepared from the corresponding 1-phenylsulfonyl-D-glucals, were coupled efficiently to various organichalides in the presence of a palladium(0) catalyst. This mild reaction is specially useful for the preparation of 1-C-aryl-D-glucals and compatible with unprotected hydroxy groups or hindered aromatic bromides. It has been shown that the resulting 1-C-aryl(alkyl)-D-glucals
Reductive elimination of glycosyl phenyl sulfones by SmI2-HMPA: A convenient synthesis of substituted pyranoid glycals
作者:Pierre de Pouilly、Alain Chénedé、Jean-Maurice Mallet、Pierre Sinaÿ
DOI:10.1016/s0040-4039(00)74718-6
日期:1992.12
A series of substituted glycosyl phenyl sulfones was converted into glycals after reductive samariation with SmI2 in the presence of hexamethylphosphoric triamide, followed by elimination of the substituent at C-2. Practically quantitative yields were obtained when the leaving group was an acetate, as illustrated here with seven substrates.
Transition-metal-free glycosyl sulfonation of diaryliodonium salts with sodium glycosyl sulfinate: an efficient approach to access glycosyl aryl sulfones
Glycosyl aryl sulfones have gained significant attention due to their diverse range of biological activities. However, a straightforward synthesis under mild conditions remains a challenging endeavor. This work presents the first transition-metal-free glycosyl sulfonation, employing a readily prepared sodium glycosyl sulfinate in conjunction with diaryliodonium salts. The method is compatible with