Organocatalytic asymmetric allylic amination of Morita–Baylis–Hillman carbonates of isatins

• Hang Zhang,
• Shan-Jun Zhang,
• Qing-Qing Zhou,
• Lin Dong and
• Ying-Chun Chen

Beilstein J. Org. Chem. 2012, 8, 1241–1245, doi:10.3762/bjoc.8.139

• Hang Zhang Shan-Jun Zhang Qing-Qing Zhou Lin Dong Ying-Chun Chen Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China 10.3762/bjoc.8.139 Abstract The

Cyanoethylation of the glucans dextran and pullulan: Substitution pattern and formation of nanostructures and entrapment of magnetic nanoparticles

• Kathrin Fiege,
• Heinrich Lünsdorf,
• Sevil Atarijabarzadeh and
• Petra Mischnick

Beilstein J. Org. Chem. 2012, 8, 551–566, doi:10.3762/bjoc.8.63

• polymer particle allows for control by magnetic fields. Magnetic separation techniques or magnetic particle imaging can be performed. Applications, such as drug delivery or targeting, hyperthermia and biosensing can be realized [16][17][18]. Binding of stabilizing organic shells to ferric oxide

• years their importance for special biochemical or pharmaceutical applications, such drug delivery or biosensor technology, has grown, due to their special properties such as water solubility, low viscosity and film formation [24][25][26][27]. Pullulan is a homopolysaccharide of D-glucose secreted by

Hyperbranched polyethylenimine bearing cyclodextrin moieties showing temperature and pH controlled dye release

• Indra Böhm,
• Susanne Katharina Kreth and
• Helmut Ritter

Beilstein J. Org. Chem. 2011, 7, 1130–1134, doi:10.3762/bjoc.7.130

• : anthraquinone; cyclodextrin; drug delivery; polyethylenimine; release; Introduction The development of novel materials and their use as drug delivery systems has gained increased interest in the last few decades [1][2][3]. In this context, certain stimuli responsive behaviors are required [4][5]. Hence, the

• compounds for a drug delivery system in combination with hyperbranched cationic polyethylenimine bearing covalently attached β-CDs 3. As outlined in Scheme 1, each dye, 1 and 2, was mixed with 3 in water to form a salt 4 and a host–guest complex 5, respectively. Additionally, both dyes were mixed together

• released separately or simultaneous in response to different external stimuli. Conclusion The controlled release of different dyes from a drug delivery system based on hyperbranched polyethylenimine was investigated. The ionic interactions between the PEI scaffold and the hydroxy moieties of 5,8-dichloro

Synthesis and self-assembly of 1-deoxyglucose derivatives as low molecular weight organogelators

• Guijun Wang,
• Hao Yang,
• Sherwin Cheuk and
• Sherman Coleman

Beilstein J. Org. Chem. 2011, 7, 234–242, doi:10.3762/bjoc.7.31

• into 3-dimensional networks. The resulting gels may find applications as soft materials for drug delivery, enzyme immobilization, scaffolds for tissue engineering, etc. [10][11][12][13][14]. The structures of LMWGs span a diverse range; carbohydrates have frequently been used in the synthesis of LMWGs

• matrices for enzymes, DNA, and drug delivery systems [22][23][24][25][26][27][28]. Glucose, in particular, is a versatile building block for the preparation of various small molecule gelators [30][31][32][33][34][35][36][37], as it is relatively easy to obtain substituted products by selective

Michael-type addition of azoles of broad-scale acidity to methyl acrylate

• Sławomir Boncel,
• Kinga Saletra,
• Barbara Hefczyc and
• Krzysztof Z. Walczak

Beilstein J. Org. Chem. 2011, 7, 173–178, doi:10.3762/bjoc.7.24

• and which, after acidic hydrolysis [43], can be anchored to drug delivery systems, including, e.g., chemically modified carbon nanotubes, via amide bonds. Examples of azole derivatives as important therapeutic agents. Michael-type addition of azoles of broad-scale acidity 1a–h to methyl acrylate (2

Exceptionally small supramolecular hydrogelators based on aromatic–aromatic interactions

• Junfeng Shi,
• Yuan Gao,
• Zhimou Yang and
• Bing Xu

Beilstein J. Org. Chem. 2011, 7, 167–172, doi:10.3762/bjoc.7.23

• ., response to external stimuli and flow in response to shear force [2]) and applications in several areas (e.g., bioanalysis [3][4], chemical sensing [5][6][7], food processing [8], cosmetics [9], drug delivery [10][11], and tissue engineering [12][13]). Inspired by the existing and potential applications of

Miniemulsion polymerization as a versatile tool for the synthesis of functionalized polymers

• Daniel Crespy and
• Katharina Landfester

Beilstein J. Org. Chem. 2010, 6, 1132–1148, doi:10.3762/bjoc.6.130

• since the monomer is very reactive and the polymerization can be conducted in the presence of a large amount of water. Moreover, the polymers were shown to be able to pass the blood brain barrier, making them ideal candidates as vectors for drug delivery. Therefore it is not surprising that several

• polymeric shell in comparison to the traditional monolithic morphology. Such capsular morphologies are suitable for drug delivery applications since the liquid in the core (e.g., water) has usually a higher solvent power than hydrophilic monomers. As for other techniques used to encapsulate drugs such as

Pyridinium based amphiphilic hydrogelators as potential antibacterial agents

• Sayanti Brahmachari,
• Sisir Debnath,
• Sounak Dutta and
• Prasanta Kumar Das

Beilstein J. Org. Chem. 2010, 6, 859–868, doi:10.3762/bjoc.6.101

• ; hydrogel; pyridinium; self-assembly; Introduction Gels are an outstanding group of soft materials lying at the interface of solid and liquid, and find numerous applications in various fields including tissue engineering, biosensors, food processing, cosmetics, photography, controlled drug delivery etc. [1

Chiral gels derived from secondary ammonium salts of (1R,3S)-(+)-camphoric acid

• Tapas Kumar Adalder,
• N. N. Adarsh,
• Ravish Sankolli and
• Parthasarathi Dastidar

Beilstein J. Org. Chem. 2010, 6, 848–858, doi:10.3762/bjoc.6.100

• continuous expanding area on account of their various promising applications [11][12][13]. Broadly, LMOGs are used in cosmetics [14], tissue engineering [15], drug delivery and biomedical applications [16][17][18][19], art conservation [20][21][22], templated synthesis of nanoparticles [23][24], capture and

Synthesis and crystal structures of multifunctional tosylates as basis for star-shaped poly(2-ethyl-2-oxazoline)s

• Richard Hoogenboom,
• Martin W. M. Fijten,
• Guido Kickelbick and
• Ulrich S. Schubert

Beilstein J. Org. Chem. 2010, 6, 773–783, doi:10.3762/bjoc.6.96

• ; Introduction Nowadays, well-defined polymer structures are of major importance for the development of ever more sophisticated and complex materials, e.g., applications in drug delivery or as adaptive materials. Star-shaped polymers are especially interesting since their properties are distinctly different from

Novel multi-responsive P2VP-block-PNIPAAm block copolymers via nitroxide-mediated radical polymerization

• Cathrin Corten,
• Katja Kretschmer and
• Dirk Kuckling

Beilstein J. Org. Chem. 2010, 6, 756–765, doi:10.3762/bjoc.6.89

• with large property changes to small external chemical or physical stimuli, are so called “smart”, “responsive” or “intelligent” polymers [1][2], constitute a very interesting group of functional polymers. Such polymers have found applications as reactive surfaces [3], in drug delivery and separation

• , we describe the synthesis of new multi-responsible diblock copolymers poly(2-vinylpyridine-block-N-isopropylacrylamide), which form schizophrenic micelles. Such micellation behavior is interesting for drug delivery systems in the gastro-intestinal tract [36][37]. Results and Discussion Polymerization

• aqueous solution, the block copolymers form so called schizophrenic micelles. The hydrodynamic radius Rh of these micelles associated with pH values and temperature was analyzed by dynamic light scattering (DLS). Such kind of block copolymers has potential for many applications, such as controlled drug

New amphiphilic glycopolymers by click functionalization of random copolymers – application to the colloidal stabilisation of polymer nanoparticles and their interaction with concanavalin A lectin

• Otman Otman,
• Paul Boullanger,
• Eric Drockenmuller and
• Thierry Hamaide

Beilstein J. Org. Chem. 2010, 6, No. 58, doi:10.3762/bjoc.6.58

• towards new formulations that can enhance the activity of drugs, as well as the elaboration of new drug delivery systems. The main objectives are the transport of active hydrophilic or lipophilic substances, while minimizing drug degradation, increasing drug availability and localization in the required

• . These parameters are closely connected. For instance, the chemical composition of the polymer matrix may affect the particle morphology because of thermodynamic interactions between the hydrophobic drug and the polymer. Whatever the drug delivery system, surfactants, and in particular polymer non-ionic

Ru-catalyzed dehydrogenative coupling of carboxylic acids and silanes - a new method for the preparation of silyl ester

• Guo-Bin Liu and
• Hong-Yun Zhao

Beilstein J. Org. Chem. 2008, 4, No. 27, doi:10.3762/bjoc.4.27

• greatly due to biomedical field and environmental concerns [2][3][4]. Obviously, silyl esters are very important intermediates for the preparation of easily degradable functional poly(silyl ester)s, widely utilized as gene delivery carriers, matrices for drug delivery, biodegradable surgical devices, and