Synthesis of peracetylated C-1-deoxyalditol- and C-glycoside-dipyrranes via dithioacetal derivatives
摘要:
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.
Synthesis of peracetylated C-1-deoxyalditol- and C-glycoside-dipyrranes via dithioacetal derivatives
摘要:
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.
Bingham, Steve J.; Tyman, John H. P.; Malik, K. M. A., Journal of Chemical Research, Miniprint, 1998, # 9, p. 2465 - 2496
作者:Bingham, Steve J.、Tyman, John H. P.、Malik, K. M. A.、Hibbs, David E.、Hursthouse, Michael B.
DOI:——
日期:——
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.