Synthesis, α-mannosidase inhibition studies and molecular modeling of 1,4-imino-ᴅ-lyxitols and their C-5-altered N-arylalkyl derivatives

• Martin Kalník,
• Sergej Šesták,
• Juraj Kóňa,
• Maroš Bella and
• Monika Poláková

Beilstein J. Org. Chem. 2023, 19, 282–293, doi:10.3762/bjoc.19.24

• compounds have been attracting attention due to their broad spectrum of biological activities [6]. A number of synthetic and naturally occurring iminosugars are able to inhibit various enzymes of medicinal interest including glycosidases, glycosyltransferases and many other carbohydrate processing enzymes

Efficient synthesis of aziridinecyclooctanediol and 3-aminocyclooctanetriol

• Emine Salamci and
• Ayse Kilic Lafzi

Beilstein J. Org. Chem. 2022, 18, 1539–1543, doi:10.3762/bjoc.18.163

• natural products and pharmaceuticals. Valienamine (3) and its analogues show inhibitory activity against certain glycosidases [11][12][13] (Figure 1). Many groups have described different synthetic methods for the synthesis of various aminocyclitols [13][14][15][16][17]. However, only few synthetic

Highly stereocontrolled total synthesis of racemic codonopsinol B through isoxazolidine-4,5-diol vinylation

• Lukáš Ďurina,
• Anna Ďurinová,
• František Trejtnar,
• Ľuboš Janotka,
• Lucia Messingerová,
• Jana Doháňošová,
• Ján Moncol and
• Róbert Fischer

Beilstein J. Org. Chem. 2021, 17, 2781–2786, doi:10.3762/bjoc.17.188

• mentioned work. Pyrrolidine 2 has been prepared before, however, it was not tested against glycosidases [6]. In addition, a very limited number of related 2-aryl-substituted hydroxylated pyrrolidines with a hydroxymethyl substituent at C-5 have been synthesized [7]. Along with (−)-codonopsinol B, five other

GlycoBioinformatics

• Kiyoko F. Aoki-Kinoshita,
• Frédérique Lisacek,
• Niclas Karlsson,
• Daniel Kolarich and
• Nicolle H. Packer

Beilstein J. Org. Chem. 2021, 17, 2726–2728, doi:10.3762/bjoc.17.184

• tightly connected to mainstream bioinformatics. For example, databases and tools from genomics can be used for gaining information about genes encoding for glycosyltransferases, glycosidases, and glycan-binding proteins (lectins), and search engines initially designed for the detection of

A systems-based framework to computationally describe putative transcription factors and signaling pathways regulating glycan biosynthesis

• Theodore Groth,
• Rudiyanto Gunawan and
• Sriram Neelamegham

Beilstein J. Org. Chem. 2021, 17, 1712–1724, doi:10.3762/bjoc.17.119

• termed glycogenes [1][2]. These glycogenes include the glycosyltransferases, glycosidases, sulfotransferases, transporters, etc. The expression of these glycogenes is in turn driven by the action of a class of proteins called transcription factors (TFs). These TFs regulate gene expression by binding

Simulating the enzymes of ganglioside biosynthesis with Glycologue

• Andrew G. McDonald and
• Gavin P. Davey

Beilstein J. Org. Chem. 2021, 17, 739–748, doi:10.3762/bjoc.17.64

• associated with melanoma [52]. The activities of glycosidases might be added to the simulators as a way to model lysosomal storage diseases (LSDs) such as Tay-Sachs, in which ganglioside GM2 accumulates as a result of a deficiency in β-N-acetylhexosaminidase activity (EC 3.2.1.52) [53]. Since Glycologue

Stereoselective syntheses of 3-aminocyclooctanetriols and halocyclooctanetriols

• Emine Salamci and
• Yunus Zozik

Beilstein J. Org. Chem. 2021, 17, 705–710, doi:10.3762/bjoc.17.59

• have become important structural components for drug development with a modifying action as inhibitors of glycosidases [4][5][6][7][8][9][10]. Aminocyclitols are amino polyhydroxy cycloalkanes [2] formally derived from cyclitols [11][12][13][14][15], which are polyhydroxylated cycloalkanes, via

• of the most important conduramines 4 is valienamine (3) [17], which is found as a building block in several aminoglycoside antibiotics [2]. Furthermore, conduramines 4 and their derivatives are used as both inhibitors of glycosidases and useful intermediates in organic synthesis [18]. Halocyclitols

• inhibitors of α-glycosidases [11][19]. Recent reviews report on the latest synthetic methodologies for aminocyclitols and related compounds [1][2][3][16]. Many methods have been previously reported for the synthesis of aminocyclitols containing five- and six-membered rings, along with their diverse

N-(1-Phenylethyl)aziridine-2-carboxylate esters in the synthesis of biologically relevant compounds

• Iwona E. Głowacka,
• Aleksandra Trocha,
• Andrzej E. Wróblewski and
• Dorota G. Piotrowska

Beilstein J. Org. Chem. 2019, 15, 1722–1757, doi:10.3762/bjoc.15.168

• ), respectively. Their enantiomers were prepared from the aziridine aldehyde (2S,1'R)-6 in an analogous manner. 2,5-Imino-2,5,6-trideoxy-ʟ-gulo-heptitol ((2S,3R,4R,5R)-184) an iminosugar isolated from Hyacintus orientalis was recognized as inhibitor of glycosidases [104]. The efficient syntheses of (2S,3R,4R,5R

• periodinane and olefination was carried out as already described. Acidic hydrolysis of N-Boc and O-TBDMS groups afforded (2S,3R,6S)-194b which was identical with the natural (+)-microcosamine A. 1-Deoxynojirimycin was discovered in several natural species and later found as a potent inhibitor of glycosidases

Synthetic and semi-synthetic approaches to unprotected N-glycan oxazolines

• Antony J. Fairbanks

Beilstein J. Org. Chem. 2018, 14, 416–429, doi:10.3762/bjoc.14.30

• ; oligosaccharides; Review Introduction Glycosyl oxazolines are high-energy intermediates on the hydrolytic pathway of some [1][2][3][4][5] (but not all) [6] of the numerous glycosidases that hydrolyse linkages between 2-acetamido sugars and other species. In particular the endo-β-N-acetylglucosaminidases [7

Exploring architectures displaying multimeric presentations of a trihydroxypiperidine iminosugar

• Camilla Matassini,
• Stefania Mirabella,
• Andrea Goti,
• Inmaculada Robina,
• Antonio J. Moreno-Vargas and
• Francesca Cardona

Beilstein J. Org. Chem. 2015, 11, 2631–2640, doi:10.3762/bjoc.11.282

• glycosidases. Keywords: dendrimers; glycosidase inhibitors; iminosugars; multivalency; piperidine alkaloids; Introduction Iminosugars are well-known naturally occurring glycomimetics with a nitrogen atom replacing the endocyclic oxygen, mainly recognized as inhibitors of carbohydrate-processing enzymes

• (glycosidases) [1][2]. In quite sharp contrast the multivalent effect, widely investigated in the field of carbohydrate–lectin interactions [3], has remained essentially unexplored concerning glycosidase inhibition up to 2010. Indeed, the first examples of multivalent iminosugars gave disappointing results in

• involving other glycosidases of therapeutic interest, in particular in the field of rare genetic diseases connected to misfolded proteins [16][17][18]. While deoxynojrimycin (DNJ) is commonly employed to build diversified multivalent architectures, relative few examples have been reported with different

Design, synthesis and photochemical properties of the first examples of iminosugar clusters based on fluorescent cores

• Mathieu L. Lepage,
• Antoine Mirloup,
• Manon Ripoll,
• Fabien Stauffert,
• Anne Bodlenner,
• Raymond Ziessel and
• Philippe Compain

Beilstein J. Org. Chem. 2015, 11, 659–667, doi:10.3762/bjoc.11.74

• the endocyclic oxygen have been reported in the literature [1][2]. Iminosugars are mainly known to be inhibitors of a number of carbohydrate-processing enzymes with an emphasis on glycosidases [1][2]. In the early 2000’s, iminosugars were, remarkably, found to inhibit metalloproteinases [3], protein

• ][21][22][23][24][25][26]. The interest of the inhibitory multivalent effect for drug discovery was demonstrated by targeting glycosidases involved in rare genetic diseases linked to misfolded proteins [24][25][26]. The first examples of multivalent iminosugars such as 2 and 3 acting as pharmacological

Synthesis and biological evaluation of a novel MUC1 glycopeptide conjugate vaccine candidate comprising a 4’-deoxy-4’-fluoro-Thomsen–Friedenreich epitope

• Manuel Johannes,
• Maximilian Reindl,
• Bastian Gerlitzki,
• Edgar Schmitt and
• Anja Hoffmann-Röder

Beilstein J. Org. Chem. 2015, 11, 155–161, doi:10.3762/bjoc.11.15

• steps. Evaluation of in vitro stability against enzymatic degradation Besides improved immunogenicity, fluorinated TACAs may also feature an enhanced stability against enzymatic degradation, since many glycosidases do not accept fluorosugars, which can even act as mechanism-based enzyme inhibitors [50

Synthesis of divalent ligands of β-thio- and β-N-galactopyranosides and related lactosides and their evaluation as substrates and inhibitors of Trypanosoma cruzi trans-sialidase

• María Emilia Cano,
• Rosalía Agusti,
• Alejandro J. Cagnoni,
• María Florencia Tesoriero,
• José Kovensky,
• María Laura Uhrig and
• Rosa M. de Lederkremer

Beilstein J. Org. Chem. 2014, 10, 3073–3086, doi:10.3762/bjoc.10.324

• the linker structure, a fact that can be also playing a role in the proportion of sialylated species listed above (Table 1 and Table 2). On the other hand, the multivalent effect for the inhibition of certain glycosidases was recently described [41][42]. To our knowledge, there is only one previous

The Shono-type electroorganic oxidation of unfunctionalised amides. Carbon–carbon bond formation via electrogenerated N-acyliminium ions

• Alan M. Jones and
• Craig E. Banks

Beilstein J. Org. Chem. 2014, 10, 3056–3072, doi:10.3762/bjoc.10.323

• ]. Iminosugars have shown a variety of biological effects including inhibiting glycosidases and glycoprotein-processing enzymes. Onomura and Matsumura and colleagues have used the anodic methoxylation and mild acid treatment strategy to prepare the initial starting materials in the synthetic campaign (Scheme 17

Synthesis of the first examples of iminosugar clusters based on cyclopeptoid cores

• Mathieu L. Lepage,
• Alessandra Meli,
• Anne Bodlenner,
• Céline Tarnus,
• Francesco De Riccardis,
• Irene Izzo and
• Philippe Compain

Beilstein J. Org. Chem. 2014, 10, 1406–1412, doi:10.3762/bjoc.10.144

• . Keywords: cyclopeptoids; glycosidases; iminosugars; inhibitors; multivalency; mutivalent glycosystems; Introduction Within a few years, the field of multivalent glycosidase inhibitors has witnessed tremendous advancement. Since the report in 2009 of the first quantifiable multivalent effect in glycosidase

• -mannosidase with β-cyclodextrin-based analogues displaying 14 copies of 1-deoxynojirimycin (DNJ) [4]. Applications of the inhibitory multivalent effect to glycosidases of therapeutic interest were promptly performed and promising results were obtained in the field of Gaucher disease, the most common lysosomal

Biosynthesis of rare hexoses using microorganisms and related enzymes

• Zijie Li,
• Yahui Gao,
• Hideki Nakanishi,
• Xiaodong Gao and
• Li Cai

Beilstein J. Org. Chem. 2013, 9, 2434–2445, doi:10.3762/bjoc.9.281

• simultaneously that can be easily separated and purified with cation exchange resin chromatography [39][57]. L-Fructose L-Fructose is a well known nonnutritive sweetener [9] and can be used as a potential inhibitor of several glycosidases [58]. Mayo et al. firstly established an enzymatic approach for the

Low-generation dendrimers with a calixarene core and based on a chiral C₂-symmetric pyrrolidine as iminosugar mimics

• Marco Marradi,
• Stefano Cicchi,
• Francesco Sansone,
• Alessandro Casnati and
• Andrea Goti

Beilstein J. Org. Chem. 2012, 8, 951–957, doi:10.3762/bjoc.8.107

• [3]. Several iminosugars have shown potential as therapeutics due to the ability to inhibit glycosidases and other enzymes associated with the metabolism of polysaccharides and the processing of glycoproteins [3]. Conjugation of iminosugars onto a polyvalent skeleton has been investigated only

• occasionally, and their properties as multivalent enzyme inhibitors gave contrasting results. Early findings indicated in fact that poor multivalent phenomena take place [4][5][6], but more recently moderate [7] to remarkable [8][9] effects have been reported on glycosidases. Unlike lectin-mediated

Sonogashira–Hagihara reactions of halogenated glycals

• Dennis C. Koester and
• Daniel B. Werz

Beilstein J. Org. Chem. 2012, 8, 675–682, doi:10.3762/bjoc.8.75

• ][3][4]. Many different monosaccharide units and the large variety of possibilities to link two subunits result in an immense variety of highly complex biomolecules [5][6][7]. In order to mimic certain subunits of oligosaccharides, e.g., for the inhibition of glycosidases or glycosyltransferases

Synthesis and biological evaluation of nojirimycin- and pyrrolidine-based trehalase inhibitors

• Davide Bini,
• Francesca Cardona,
• Matilde Forcella,
• Camilla Parmeggiani,
• Paolo Parenti,
• Francesco Nicotra and
• Laura Cipolla

Beilstein J. Org. Chem. 2012, 8, 514–521, doi:10.3762/bjoc.8.58

• scarcely characterised. Keywords: glycosidases inhibitors; iminosugars; nojirimycins; pyrrolidines; trehalases; Introduction Trehalase (EC3.2.1.28) is a glycosidase that catalyses trehalose (α-D-glucopyranosyl-α-D-glucopyranoside 1, Figure 1) [1][2][3] hydrolysis. It was found initially at the end of the

• compounds in terms of their inhibitory activity against other glycosidases of interest, such as maltase, isomaltase, sucrase, glucoamylase, lactase and α-amylase. Experimental Synthesis General methods Solvents were dried over molecular sieves for at least 24 h prior to use, when required. When dry

Facile synthesis of nitrophenyl 2-acetamido-2-deoxy-α-D-mannopyranosides from ManNAc-oxazoline

• Karel Křenek,
• Petr Šimon,
• Lenka Weignerová,
• Barbora Fliedrová,
• Marek Kuzma and
• Vladimír Křen

Beilstein J. Org. Chem. 2012, 8, 428–432, doi:10.3762/bjoc.8.48

• partly to the content of ManNAc. Thus, ManNAc units play a significant role in bacterial pathogenicity and virulence (e.g., Streptococcus pneumoniae) [4][5]. Surprisingly, glycosidases active upon β-ManpNAc and α-ManpNAc glycosides are not known so far. Therefore, the building blocks for the chemical

Amine-linked diglycosides: Synthesis facilitated by the enhanced reactivity of allylic electrophiles, and glycosidase inhibition assays

• Ian Cumpstey,
• Jens Frigell,
• Elias Pershagen,
• Tashfeen Akhtar,
• Elena Moreno-Clavijo,
• Inmaculada Robina,
• Dominic S. Alonzi and
• Terry D. Butters

Beilstein J. Org. Chem. 2011, 7, 1115–1123, doi:10.3762/bjoc.7.128

• glycosidase inhibitory activity. Keywords: amination; glycomimetics; glycosidases; Mitsunobu; pseudodisaccharides; Introduction We have been interested in synthesising molecules consisting of two monosaccharides linked by formal condensation without using the anomeric position [1]. Such molecules, termed

• diglycoses (or neodisaccharides), are linked by ether, amine, thioether, selenoether, etc., bridges, and so are presumably more stable to hydrolysis by acid or glycosidases than (glycosidic) disaccharides. Diglycoses have many features in common with disaccharides, with a similar general appearance, size

• nitrogen atom bind more strongly to glycosidases than do the corresponding ether or thioether derivatives [5]. It follows that amine-linked diglycose derivatives may act as glycosidase inhibitors. We set about the synthesis of some compounds of this type to test this hypothesis. In our initial

Synthesis of glycosylated β³-homo-threonine conjugates for mucin-like glycopeptide antigen analogues

• Florian Karch and
• Anja Hoffmann-Röder

Beilstein J. Org. Chem. 2010, 6, No. 47, doi:10.3762/bjoc.6.47

• instance, stable TACA mimics comprising C-glycosides [11][12][13][14], S-glycosides [15][16][17][18][19] and deoxyfluoro sugars [20] have been used to circumvent hydrolytic degradation by endogenous glycosidases. In principle, antigenicity of the artificial TACA derivatives should be enhanced by minor

Synthesis of lipophilic 1-deoxygalactonojirimycin derivatives as D-galactosidase inhibitors

• Georg Schitter,
• Elisabeth Scheucher,
• Andreas J. Steiner,
• Arnold E. Stütz,
• Martin Thonhofer,
• Chris A. Tarling,
• Stephen G. Withers,
• Jacqueline Wicki,
• Katrin Fantur,
• Eduard Paschke,
• Don J. Mahuran,
• Brigitte A. Rigat,
• Michael Tropak and
• Tanja M. Wrodnigg

Beilstein J. Org. Chem. 2010, 6, No. 21, doi:10.3762/bjoc.6.21

• provided lipophilic 1-deoxygalactonojirimycin derivatives which exhibit inhibitory properties against β-glycosidases from E. coli and Agrobacterium sp. as well as green coffee bean α-galactosidase. In preliminary studies, these compounds also showed potential as chemical chaperones for GM1-gangliosidosis

• -glycosidases from Agrobacterium sp. (β-glu/gal Abg), E. coli (β-gal E. coli) as well as with the α-galactosidase from green coffee beans (α-gal GCB). Supporting Information Supporting Information File 4: Full experimental details and characterisation data Acknowledgements G. S. thanks the Institute of

(Pseudo)amide-linked oligosaccharide mimetics: molecular recognition and supramolecular properties

• José L. Jiménez Blanco,
• Fernando Ortega-Caballero,
• Carmen Ortiz Mellet and
• José M. García Fernández

Beilstein J. Org. Chem. 2010, 6, No. 20, doi:10.3762/bjoc.6.20

• hydrogen bonding in the form of a 16-membered ring, characteristic for β-peptides (Figure 4) [29]. Analogously, NMR and IR data of a β(1→6)-linked unsaturated glycamino acid tetramer showed a turn-like structure in chloroform solution [31]. Glycoamino acid-based carbopeptoids are resistant to glycosidases

Synthesis of densely functionalized enantiopure indolizidines by ring- closing metathesis (RCM) of hydroxylamines from carbohydrate- derived nitrones

• Marco Bonanni,
• Marco Marradi,
• Francesca Cardona,
• Stefano Cicchi and
• Andrea Goti

Beilstein J. Org. Chem. 2007, 3, No. 44, doi:10.1186/1860-5397-3-44

• instance, the plant-derived polyhydroxylated indolizidines are well known as potent glycosidases inhibitors, and for this reason they are potential therapeutic agents. [2][3][4] A great deal of research is still devoted to the structural elucidation of these alkaloids as well as to their total syntheses