An efficient route to regio- and stereoselective synthesis of 3-amino-3-deoxy sugars
作者:Taleb H. Al-Tel、Raed A. Al-Qawasmeh、Christoph Schröder、Wolfgang Voelter
DOI:10.1016/0040-4020(95)00087-o
日期:1995.3
Starting from the trans-oriented hydroxy-epoxy pentoses (1, 8 and 15) and benzoylisocyanate a regio- and stereoselectiveroute via the benzoylcarbamate intermediates 2, 9 and 16 to the 3-amino-3-deoxy sugars 7, 14 and 18 is described.
A newclass of pharmacologically interesting compounds has been synthesized through a novel SN2 dispalcement of the CF3SO2 group in benzyl 2,3-anhydro-4-trifluoromethylsulphonyl-α-D-ribopyranoside (1) and its β-L-isomer (2), by a variety of suitably protected naturally occurring aminoacids: the reaction pathway also provides an efficient route to benzyl 2,3-anhydro-β-L- and -α-D-lyxopyranosides [(3)
一类新的药理学上感兴趣的化合物已经通过一种新颖的合成小号Ñ的CF 2 dispalcement 3 SO 2在苄基2,3-脱水-4-三氟甲基磺酰基- α- d -ribopyranoside(1)和它的β-大号-异构体(2),可以通过各种适当保护的天然存在的氨基酸来实现:反应途径还提供了通往2,3,3-脱水-β - L-和-α - D- lyxopyranosides [(3)和(4)的有效途径) 分别]。
Synthesis and inhibition properties of a series of pyranose derivatives towards a Zn-metalloproteinase from Saccharomonospora canescens
作者:Pavlina Dolashka-Angelova、Raid J. Abdel-Jalil、Raed A. Al-Qawasmeh、Nicolina Stambolieva、Wolfgang Voelter
DOI:10.1016/j.carres.2010.07.038
日期:2010.11
The Zn-proteinase, isolated from Saccharomonospora canescens (NPS), shares many common features with thermolysin, but considerable differences are also evident, as far as the substrate recognition site is concerned. In substrates of general structure AcylAlaAlaPhe 4NA, this neutral proteinase cleaves only the arylamide bond (non-typical activity of Zn-proteinases), while thermolysin attacks the peptide bond Ala-Phe. Phosphoramidon is a powerful tight binding inhibitor for thermolysin and significantly less specific towards NPS. The K-i-values (65 mu M for NPS vs 0.034 mu M for thermolysin) differ nearly 2000-folds. This implies significant differences in the specificity of the corresponding subsites. The carbohydrate moiety is supposed to accommodate in the S-1-subsite and the series of arabinopyranosides and glucopyranosides (12 compounds), which are assayed as inhibitors in a model system: NPS with SucAlaAlaPhe4NA as a substrate could be considered as mapping the S-1-subsite of NPS. Members of the series with an additional ring (3,4-epithio, 3,4-anhydro-derivatives) turned out to be reasonably good competitive inhibitors (K-i approximate to 0.1-0.2 mM are of the same order as the value for phosphoramidon). The structure of these compounds (8, 9, 11 and 12) seems to fit the size of the S-1-subsite and due to an appropriately oriented OH-group in addition, to protect the active site Zn2+. (C) 2010 Published by Elsevier Ltd.
Zarga, Musa H. Abu; Al-Tel, Taleb H.; Voelter, Wolfgang, Zeitschrift fur Naturforschung, B: Chemical Sciences, 1995, vol. 50, # 4, p. 697 - 698
作者:Zarga, Musa H. Abu、Al-Tel, Taleb H.、Voelter, Wolfgang
DOI:——
日期:——
Latif, Farzana; Malik, Abdul; Voelter, Wolfgang, Liebigs Annalen der Chemie, 1987, p. 617 - 620