描述了blintol,天然存在的糖苷酶抑制剂salacinol的硒同类物以及有效的葡萄糖苷酶抑制剂本身的有效合成。与我们先前报道的合成方法不同,这种改进的途径在合成两个关键中间体之一2,3,5-tri- O - p-甲氧基苄基-1,4-脱水-4中利用了对甲氧基苄基醚保护基-seleno- d -arabinitol,从升木糖。另一关键中间体,2,4- ö -benzylidene-升-赤-1,3-环硫酸酯,成功地从制备d -葡萄糖代替昂贵升-葡萄糖。用三氟乙酸除去所得加合物中的所有保护基,得到立体异构体的混合物,从而避免了氢解引起苄基醚脱保护的问题。然后通过分步结晶获得主要的立体异构体blintol。
Synthesis of 2-amido, 2-amino, and 2-azido derivatives of the nitrogen analogue of the naturally occurring glycosidase inhibitor salacinol and their inhibitory activities against O-GlcNAcase and NagZ enzymes
作者:Niloufar Choubdar、Ramakrishna G. Bhat、Keith A. Stubbs、Scott Yuzwa、B. Mario Pinto
DOI:10.1016/j.carres.2008.02.027
日期:2008.7
reduction of the azide and subsequent methylation of the resulting amine in one pot. A similar reaction, with ethanol as the solvent, gave the N-ethyl derivative. The 2-amino analogues were finally obtained by the reduction of the azide function using triphenylphosphine. Acylation of the amine using acetic, propionic, or valeric anhydride afforded the corresponding 2-amido derivatives. Deprotection of
Synthesis of Alkylated Deoxynojirimycin and 1,5-Dideoxy-1,5-iminoxylitol Analogues: Polar Side-Chain Modification, Sulfonium and Selenonium Heteroatom Variants, Conformational Analysis, and Evaluation as Glycosidase Inhibitors
作者:Monica G. Szczepina、Blair D. Johnston、Yue Yuan、Birte Svensson、B. Mario Pinto
DOI:10.1021/ja0482076
日期:2004.10.1
The syntheses of N-alkylated deoxynojirimycin and 1,5-dideoxy-1,5-iminoxylitol derivatives having either a D- or an L-erythritol-3-sulfate functionalized N-substituent are reported. The alkylating agent used was a cyclic sulfate derivative, whereby selective attack of the nitrogen atom at the least hindered primary center afforded the desired ammonium salt. In aqueous solution, these salts were configurationally
Synthesis of new analogues of salacinol containing a pendant hydroxymethyl group as potential glycosidase inhibitors
作者:Ravindranath Nasi、B. Mario Pinto
DOI:10.1016/j.carres.2006.06.022
日期:2006.10
The synthesis of new analogues of the naturally occurring glycosidaseinhibitor, salacinol, and its ammonium analogue, ghavamiol is described. These analogues contain an additional hydroxymethyl group at C-1, which was intended to form additional polar contacts within the active site of glycosidase enzymes. The target zwitterionic compounds were synthesized by means of nucleophilic attack at the least
Synthesis of Nitrogen Analogues of Salacinol and Their Evaluation as Glycosidase Inhibitors
作者:Ahmad Ghavami、Blair D. Johnston、Morten T. Jensen、Birte Svensson、B. Mario Pinto
DOI:10.1021/ja0103750
日期:2001.7.1
these ammonium derivatives should function in a manner similar to that of known glycosidaseinhibitors of the alkaloid class such as castanospermine (4) and deoxynojirimycin (5). Enzyme inhibition assays indicate that salacinol (7) is a weak (K(i) = 1.7 mM) inhibitor of glucoamylase, whereas compounds 11 and 12 inhibit glucoamylase with K(i) values in the range approximately 10-fold higher. The nitrogen
A New Class of Glycosidase Inhibitor: Synthesis of Salacinol and Its Stereoisomers
作者:Ahmad Ghavami、Blair D. Johnston、B. Mario Pinto
DOI:10.1021/jo001444g
日期:2001.4.1
Salacinol (4) is one of the active principles in the aqueous extracts of Salacia reticulata that are traditionally used in Sri Lanka and India for the treatment of diabetes. The syntheses of salacinol (4), the enantiomer of salacinol (5), and a diastereomer (7) are described. The synthetic strategy relies on the selective nucleophilic attack of 2,3,5-tri-O-benzyl-1,4-anhydro-4-thio-D- or L-arabinitol