Direct conversion of 1-deoxy-1-nitroalditols to methyl glycofuranosides
作者:M. Vojtech、M. Petrušová、B. Pribulová、L. Petruš
DOI:10.1016/j.tetlet.2008.03.044
日期:2008.5
Treatment of the sodium nitronate forms of 1-deoxy-1-nitrohexitols with methanolic sulfuric or hydrochloric acid at −30 °C leads to their regiospecific conversion to the corresponding methyl glycofuranosides. The reaction exhibits more pronounced stereoselectivity for 1-deoxy-1-nitroalditols with the 2,3-erythro configuration than with the 2,3-threo substrates and cis methyl glycofuranosides are the
Methyl glycosides via Fischer glycosylation: translation from batch microwave to continuous flow processing
作者:Jonas Aronow、Christian Stanetty、Ian R. Baxendale、Marko D. Mihovilovic
DOI:10.1007/s00706-018-2306-8
日期:2019.1
AbstractA continuous flow procedure for the synthesis of methylglycosides (Fischer glycosylation) of various monosaccharides using a heterogenous catalyst has been developed. In-depth analysis of the isomeric composition was undertaken and high consistency with corresponding results observed under microwave heating was obtained. Even in cases where addition of water was needed to achieve homogeneity—a
抽象的 已经开发出使用异质催化剂合成各种单糖的甲基糖苷(费歇尔糖基化)的连续流动程序。对异构体组成进行了深入分析,得到了与微波加热下观察到的相应结果高度一致的结果。即使在需要添加水来实现均匀性的情况下(流动实验的先决条件),也没有发现对转化产生不利影响。可扩展性在模型案例(甘露糖)上得到了证明,并作为d -甘油- d -甘露庚糖靶向合成的一部分,均以多克规模进行。 图形概要
Kinetically Controlled Fischer Glycosidation under Flow Conditions: A New Method for Preparing Furanosides
Kinetically controlled Fischer glycosidation was achieved under flow conditions. β-Hydroxy-substituted sulfonic acid functionalized silica (HO-SAS) was used as an acid catalyst. This reaction directly converted aldohexoses into kinetically favored furanosides to enable the practical synthesis of furanosides. After optimization of the reaction temperature and residence time, glucofuranosides, galactofuranosides