据报道,从胎盘草中分离出的甾族糖苷Sokodoside B的三糖的化学合成。为了获得更好的结果,使用了通过使用固定在二氧化硅上的H 2 SO 4与N-碘代琥珀酰亚胺联用的硫糖苷活化来进行立体选择性,高产的糖基化策略。进行后期TEMPO介导的氧化,以形成所需的糖醛酸部分。还通过使用双糖基化方法制备了靶三糖的类似物。
Concise synthesis of two trisaccharides related to the saponin isolated from Centratherum anthelminticum
作者:Santanu Mandal、Balaram Mukhopadhyay
DOI:10.1016/j.tet.2007.08.077
日期:2007.11
Chemical synthesis of two trisaccharidesrelated to the saponinisolatedfrom Centratherum anthelminticum is reported. Stereoselective, high-yielding glycosylation strategies were developed using H2SO4 immobilized on silica for activation of trichloroacetimidate donors, or in conjunction with N-iodosuccinimide for activation of a thioglycoside. A late stage TEMPO-mediated oxidation was performed for
报道了从炭疽病菌中分离出的与皂苷有关的两种三糖的化学合成。使用固定在二氧化硅上的H 2 SO 4活化三氯乙酰亚氨酸酯供体,或与N-碘琥珀酰亚胺联用来活化硫糖苷,开发了立体选择性,高产糖基化策略。进行后期TEMPO介导的氧化,以形成所需的糖醛酸部分。
Synthesis of two trisaccharides related to the triterpenoid saponin eryloside isolated from the sponge Erylus nobilis
The chemical synthesis of two trisaccharidesrelated to the triterpenoidsaponin eryloside from commercially available d-galactose, l-arabinose and d-glucosamine hydrochloride via rational protecting group manipulations is reported. The required glycosylations were carried out by the extensive use of thioglycoside chemistry where the activations were achieved by using NIS in the presence of La(OTf)3
[Cp*IrCl2](2) is used as an efficient promoter for the synthesis of sugar acetals and ketals with good to excellent yields. The catalyst is found to be general for a wide range of sugars. (C) 2011 Elsevier Ltd. All rights reserved.