Synthesis of N-(β-d-glycuronopyranosyl)alkanamides and 1-(β-d-glycuronopyranosyl)-4-phenyl-[1,2,3]-triazoles as N-glycoprotein linkage region analogs: examination of the effect of C5 substituent on the N-glycosidic torsion (ΦN) based on X-ray crystallography
摘要:
The torsion angle around the N-glycoprotein linkage region (GlcNAc-Asn) is an important factor for presenting sugar on the cell surface which is crucial for many biological processes. Earlier studies using model and analogs showed that this important torsion angle is greatly influenced by substitutions in the sugar part. In the present work, uronic acid alkanamides and triazole derivatives have been designed and synthesized as newer analogs of N-glycoprotein linkage region to understand the influence of the carboxylic group on linkage region torsion as well as on molecular packing. Crystal structure of N-(beta-D-galacturonopyranosyl)acetamide is solved with the space group of P22(1)2(1). Comparison of the torsion angle and molecular packing of this compound with N-(beta-D-galactopyranosyl)acetamide showed that changing the C6-hydoxymethyl group to the carboxylic acid group has minimum influence on the N-glycosidic torsion angle, Phi(N) and significant influence on the molecular packing. (C) 2013 Elsevier Ltd. All rights reserved.
Stereoselective Synthesis of α-Glycosyl Azides by TMSOTf-Mediated Ring Opening of 1,6-Anhydro Sugars
作者:Mathieu L. Lepage、Anne Bodlenner、Philippe Compain
DOI:10.1002/ejoc.201201580
日期:2013.4
Access to α-glycosylazides in modest to high diastereoselectivity by way of TMSN3 ring-opening of 1,6-anhydrosugars mediated by TMSOTf is reported. The reaction tolerates a wide variety of functional groups including alcohol, alkyne,
Radical Dehydroxymethylative Fluorination of Carbohydrates and Divergent Transformations of the Resulting Reverse Glycosyl Fluorides
作者:Xin Zhou、Han Ding、Pengwei Chen、Li Liu、Qikai Sun、Xianyang Wang、Peng Wang、Zhihua Lv、Ming Li
DOI:10.1002/anie.201914557
日期:2020.3.2
C-F bond activation, and our method thus offers a concise and efficient strategy for the synthesis of reverse glycosides by late-stage diversification of RGFs. The potential of this method is showcased by the preparation and diversification of sotagliflozin, leading to the discovery of a promising SGLT2 inhibitor candidate.