Synthesis of peracetylated C-1-deoxyalditol- and C-glycoside-dipyrranes via dithioacetal derivatives
作者:Stephanie M.S. Ló、Juliana C. Cunico、Diogo R.B. Ducatti、Alexandre Orsato、M. Eugênia R. Duarte、Sandra M.W. Barreira、Miguel D. Noseda、Alan G. Gonçalves
DOI:10.1016/j.tetlet.2012.12.048
日期:2013.2
Dipyrranes bearing peracetylated mono- or disaccharidic C-1-deoxyalditol moieties were prepared from D-galactose, c-glucose, c-mannose, and lactose. A partially hydrolyzed polysaccharide (agarose) was also used as starting material for the synthesis of a disaccharide-containing C-glycoside dipyrrane. These compounds were synthesized as follows: the sugar starting materials were first submitted to a mercaptolysis-acetylation one-pot procedure (EtSH/HCl-Ac2O/pyridine). The resulting peracetylated diethyl dithioacetals were converted into dipyrranes through carbonyl deprotection (H5IO6, THF-Et2O) followed by TFA-catalyzed pyrrole condensation with yields up to 62%. Overall yields from sugar starting materials were up to 49%. (C) 2012 Published by Elsevier Ltd.
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