New synthesis of 3-(β-D-glucopyranosyl)-5-substituted-1,2,4-triazoles, nanomolar inhibitors of glycogen phosphorylase
摘要:
O-Perbenzoylated 5-(beta-D-glucopyranosyl)tetrazole was reacted with N-benzyl carboximidoyl chlorides to give the corresponding 4-benzyl-3-(beta-D-glucopyranosyl)-5-substituted-1,2,4-triazoles. Removal of the O-benzoyl and N-benzyl protecting groups by base catalysed transesterification and catalytic hydrogenation, respectively, furnished a series of 3-(beta-D-glucopyranosyl)-5-substituted-1,2,4-triazoles with aliphatic, mono- and bicyclic aromatic, and heterocyclic substituents in the 5-position. Enzyme kinetic studies revealed these compounds to inhibit rabbit muscle glycogen phosphorylase b: best inhibitors were the 5-(4-aminophenyl)- (K-i 0.67 mu M) and the 5-(2-naphthyl)-substituted (K-i 0.41 mu M) derivatives. This study uncovered the C-glucopyranosyl-1,2,4-triazoles as a novel skeleton for nanomolar inhibition of glycogen phosphorylase. (C) 2014 Elsevier Masson SAS. All rights reserved.
C-Glycosyl 1,2,4-triazoles: Synthesis of the 3-β-d-glucopyranosyl-1,5-disubstituted and 5-β-d-glucopyranosyl-1,3-disubstituted variants
作者:Katalin E. Szabó、András Páhi、László Somsák
DOI:10.1016/j.tet.2017.05.014
日期:2017.7
Highly variable synthetic routes were elaborated toward trisubstituted C-glycopyranosyl 1,2,4-triazoles. N-Acyl-thioamide derivatives were obtained by acylation of O-perbenzoylated 2,6-anhydro-d-glycero-d-gulo-heptonothioamide by acid chlorides and of thioamides by O-perbenzoylated 2,6-anhydro-d-glycero-d-gulo-heptonoyl chloride. These precursors reacted with substituted hydrazines in a regioselective
精心设计了高度可变的合成路线,以形成三取代的C-甘露糖基1,2,4-三唑。Ñ酰基硫代酰胺衍生物通过酰化得到ö -perbenzoylated 2,6-脱水- d -甘油基- d -庚糖酸氯化物和硫代酰胺通过-heptonothioamide ö -perbenzoylated 2,6-脱水- d -甘油基- d -庚-heptonoyl酰氯。这些前体以区域选择性的方式与取代的肼反应,生成3-β- d-吡喃葡萄糖基-1,5-二取代-和5-β- d-吡喃葡萄糖基-1,3-二取代-1,2,4-三唑。类似的N-酰基-2,6-脱水庚酰胺不能使上述三唑与肼结合。通过Zemplén方法对C-葡萄糖基1,2,4-三唑进行O-脱保护,得到的测试化合物没有抑制兔肌肉糖原磷酸化酶b的作用。
<i>C</i>-Glucopyranosyl-1,2,4-triazoles As New Potent Inhibitors of Glycogen Phosphorylase
Glycogen phosphorylase inhibitors are considered as potential antidiabetic agents. 3-(beta-D-Glucopyranosyl)-5-substituted-1,2,4-triazoles were prepared by acylation of O-perbenzoylated N-1-tosyl-C-beta-D-glucopyranosyl formamidrazone and subsequent removal of the protecting groups. The best inhibitor was 3-(beta-D-glucopyranosyl)-5-(2-naphthyl)-1,2,4-triazole (K-i = 0.41 mu M against rabbit muscle glycogen phosphorylase b).